Saturday, April 4, 2026

Interference in Light vs Quantum States

đŸ”Ŧ The Double-Slit Experiment: Where It All Begins

One of the most famous demonstrations of interference is the double-slit experiment. When light passes through two closely spaced slits, it does not simply form two bright lines on a screen behind them. Instead, it produces a series of alternating bright and dark bands, known as an interference pattern. This happens because the light waves emerging from the two slits overlap and interfere—constructively at some points and destructively at others.

What makes this experiment even more remarkable is that the same pattern appears even when particles like photons are sent one at a time. Each particle seems to interfere with itself, as if it travels through both slits simultaneously. This reveals a fundamental truth about quantum systems: they exist in multiple states at once until measured.

This behavior closely mirrors what happens in quantum computing. A qubit in superposition is like a particle passing through both slits at once. The quantum algorithm then manipulates phases so that, when the “paths” recombine, they interfere in a way that enhances correct answers and cancels incorrect ones. Just as the interference pattern reveals the underlying wave behavior of light, the final measurement in a quantum computer reveals the result shaped by interference.

 đŸŒŠ Interference of Light in Quantum Computing: The Hidden Engine of Quantum Power

Quantum computing is often described as the next revolution in technology, promising to solve problems that are practically impossible for classical computers. But what makes it so powerful? While terms like superposition and entanglement get a lot of attention, there is another equally important principle quietly doing most of the heavy lifting: interference. Interestingly, this concept originates from one of the most familiar phenomena in physics—the interference of light.

To truly understand how quantum computers work, we need to step back and look at how waves behave. In classical physics, when two light waves overlap, they don’t just pass through each other unaffected. Instead, they combine in a way that can either amplify or cancel each other out. This is known as interference. When the peaks of two waves align, they produce a brighter result—this is called constructive interference. On the other hand, when a peak meets a trough, they cancel each other, leading to darkness, which is destructive interference. This simple idea, observable in experiments like double-slit patterns, becomes incredibly powerful when translated into the quantum world.

In quantum computing, the objects we deal with—qubits—do not behave like classical bits. A classical bit is straightforward: it is either 0 or 1. A qubit, however, exists in a combination of both states simultaneously, thanks to the principle of superposition. Mathematically, we describe this as a weighted combination of states, where each state has an associated probability amplitude. These amplitudes are not just numbers; they behave like waves. And just like waves, they can interfere.

This wave-like behavior of quantum states is where interference enters the picture. When a quantum computation begins, qubits are typically placed into a superposition, allowing the system to represent many possible solutions at once. At this stage, it might seem like quantum computers are simply trying all possibilities simultaneously, but that’s only part of the story. The real magic happens afterward, when quantum operations manipulate the phases of these amplitudes. Phase can be thought of as the position of a wave in its cycle, and even small changes in phase can dramatically affect how waves combine.

As the computation progresses, quantum gates carefully adjust these phases, setting up the system so that when the amplitudes combine, they interfere in a very specific way. This is the heart of quantum algorithms. Instead of checking each possible solution individually, the algorithm engineers interference patterns such that incorrect solutions cancel each other out through destructive interference, while the correct solutions reinforce themselves through constructive interference. In other words, the computation is designed so that the wrong answers effectively eliminate themselves.

This idea becomes clearer when we think about search problems. Imagine trying to find a specific item in a massive unsorted database. A classical computer would need to check entries one by one, which could take an enormous amount of time. A quantum computer, however, uses superposition to consider all possibilities at once and interference to suppress the wrong answers. Over a series of operations, the probability of measuring the correct answer increases, not by brute force, but by carefully orchestrated wave interactions.

What makes this even more fascinating is that in some implementations of quantum computing, interference is not just an abstract mathematical concept—it is physically realized using light itself. In photonic quantum computing, photons are used as qubits, and optical components such as beam splitters and interferometers are employed to control their paths and phases. These setups closely resemble classical optics experiments, where light beams split, travel different paths, and recombine to produce interference patterns. In this case, however, those patterns directly correspond to computational results.

The importance of interference in quantum computing cannot be overstated. Without it, superposition alone would not provide any computational advantage. Simply having access to many possible states at once is not useful unless there is a mechanism to extract the correct answer efficiently. Interference provides that mechanism. It acts as a filter, amplifying what we want and canceling what we don’t. This is why many quantum algorithms, including those designed for searching and factorization, rely fundamentally on interference as a core step in their process.

From an intuitive perspective, quantum computing can be thought of as a three-stage process. First, superposition allows the system to explore a vast landscape of possibilities. Second, interference reshapes this landscape by removing the incorrect paths and enhancing the correct ones. Finally, measurement reveals the result, collapsing the system into a single outcome. The brilliance of this approach lies in the fact that the system does not need to explicitly evaluate every possibility. Instead, it uses the natural behavior of waves to guide itself toward the solution.

In conclusion, the interference of light is not just a beautiful physical phenomenon—it is a foundational principle that enables quantum computation. By leveraging the wave nature of quantum states, quantum computers perform calculations in a fundamentally different way from classical machines. They do not merely process information; they manipulate probability amplitudes, allowing interference to do the work of eliminating errors and highlighting solutions. As research in quantum technologies continues to advance, understanding concepts like interference will be essential for grasping how these extraordinary machines operate and why they hold such transformative potential.


References :

1. https://www.facebook.com/share/v/1B3YD6Cbzw/

2. https://youtu.be/tsbCSkvHhMo?si=kUyZ9U6q3Uc9u6yY

3. https://www.ibm.com/think/topics/quantum-computing

4. https://research.google/research-areas/quantum-computing/

5. https://blog.google/company-news/inside-google/message-ceo/our-progress-toward-quantum-error-correction/

✍️ Quantum computing is not just faster computing—it is a new way of thinking, powered by the subtle and elegant dance of waves.

Wednesday, March 25, 2026

Google Password Manager to Bitwarden and Norton

 

Why I Switched to Bitwarden and Norton from Google Password Manager ?

In today’s digital-first world, our lives are deeply connected to the internet. From social media and emails to banking, coding platforms, and cloud storage—everything depends on secure authentication. Passwords are the keys to this digital life, yet for a long time, I didn’t treat them with the seriousness they deserved.

Like many users, I relied heavily on convenience. Browser autofill, easy-to-remember passwords, and Google Password Manager seemed “good enough.” But as my responsibilities grew—both as a computer science student and a developer—I began to realize that “good enough” security is often not secure at all.

That realization led me to completely rethink my approach. I eventually switched to Bitwarden for password management and Norton for overall system security. At the same time, I consciously moved away from Google Password Manager. This blog is a detailed reflection of that journey—what pushed me to change, why I chose these tools, and how this decision improved my digital life.

My Old Workflow: Convenient but Risky

Before switching, my entire password system revolved around Google Password Manager. Since I used Chrome and Android daily, it felt natural and effortless. Passwords were saved automatically, synced across devices, and autofilled whenever needed.

At first glance, it seemed perfect. But over time, cracks started to appear.

  • I reused passwords across multiple sites

  • I depended entirely on one Google account

  • I had little control over password organization

  • I rarely reviewed or updated old credentials

As my number of accounts increased, things became messy. Managing credentials for development tools, GitHub, hosting services, and educational platforms became increasingly difficult. I needed something more structured and secure.

Why I Stopped Using Google Password Manager

Let me be clear—Google Password Manager is not a bad tool. For casual users, it’s actually quite effective. But my needs had evolved beyond what it could offer.

1. Over-Reliance on a Single Ecosystem

Everything was tied to my Google account. If anything went wrong—like account compromise or lockout—I risked losing access to everything at once.

This “single point of failure” became my biggest concern.

2. Limited Cross-Platform Flexibility

While Google Password Manager works great in Chrome, it’s not as seamless outside that environment. As a developer, I often switch between browsers and systems. I needed something that worked everywhere, not just within Google’s ecosystem.

3. Lack of Advanced Control

I wanted more than just saving and autofilling passwords. I needed:

  • Better organization (folders, tags, categories)

  • Secure storage for notes and sensitive data

  • Easy export/import options

  • More visibility and control over my vault

Google Password Manager felt too basic for these needs.

4. Transparency Concerns

As someone in tech, I value transparency. With proprietary systems, you don’t always know how things are implemented internally. I preferred a solution that could be audited and trusted by the community.

5. Not Built for Power Users

Once you start handling multiple accounts, APIs, credentials, and development environments, basic tools start to feel limiting. I needed something more robust and customizable.

These reasons collectively pushed me to explore alternatives—and that’s when I discovered Bitwarden.

Why Bitwarden Became My Primary Password Manager

Switching to Bitwarden was one of the best decisions I’ve made in terms of digital security.

1. Open Source = Trust and Transparency

Bitwarden is open source, meaning its code is publicly available for inspection. This builds a level of trust that proprietary tools simply cannot match.

Knowing that security experts can audit the system gave me confidence in its reliability.

2. Strong End-to-End Encryption

Bitwarden ensures that all my data is encrypted locally before it’s ever stored or synced. Even Bitwarden itself cannot access my passwords.

This “zero-knowledge” architecture is exactly what I was looking for.

3. True Cross-Platform Support

Whether I’m using:

  • Windows or Linux

  • Chrome, Firefox, or Edge

  • Android or web apps

Bitwarden works seamlessly everywhere. This independence is a huge advantage.

4. Advanced Features for Organization

Bitwarden allows me to:

  • Organize credentials into folders

  • Store secure notes

  • Save identities and payment details

  • Quickly search and filter entries

This level of organization has made my digital life much cleaner.

5. Built-in Password Generator

I now use strong, unique passwords for every account. Bitwarden generates and stores them automatically, so I don’t have to remember anything manually.

6. Affordable (Even Free)

The free plan is incredibly powerful, and even the premium version is very affordable. As a student, this mattered a lot.

7. Future-Proof with Self-Hosting

Although I haven’t used it yet, Bitwarden offers the option to self-host your own server. This gives maximum control—something I may explore in the future.

Why I Added Norton for Complete Protection

While Bitwarden solved password management, I realized that passwords are only one part of cybersecurity. Devices themselves also need protection.

That’s why I added Norton to my setup.

1. Real-Time Threat Protection

Norton actively monitors my system for:

  • Malware

  • Ransomware

  • Phishing attempts

  • Suspicious downloads

This proactive protection is crucial.

2. Dark Web Monitoring

One of my favorite features—Norton alerts me if my data appears in known breaches or leaks. This allows me to take immediate action.

3. Secure VPN

Public Wi-Fi networks can be dangerous. Norton’s VPN ensures that my browsing activity remains private and encrypted.

4. Identity Protection

With increasing cybercrime, identity theft is a real threat. Norton helps monitor and protect my personal information.

5. All-in-One Security Layer

Instead of relying on multiple scattered tools, Norton provides a centralized security solution for my device.

The Power of Combining Bitwarden and Norton

Using both tools together gives me a layered security approach:

  • Bitwarden protects my credentials

  • Norton protects my device and network

This combination ensures that even if one layer is compromised, the other still provides protection.

This is a core principle in cybersecurity: defense in depth.

Real-Life Improvements After Switching

Since making this transition, I’ve experienced noticeable improvements:

1. No More Password Reuse

Every account now has a unique password. This drastically reduces risk.

2. Faster Logins

Autofill with Bitwarden is smooth and reliable across platforms.

3. Cleaner Organization

I can instantly find any credential without confusion.

4. Increased Awareness

Norton constantly reminds me to stay cautious and informed.

5. Better Digital Discipline

I’ve developed healthier habits around security and privacy.

Challenges During the Transition

The switch wasn’t completely effortless:

  • Exporting passwords from Google took time

  • Importing and organizing them in Bitwarden required effort

  • Adjusting habits took discipline

But these were short-term inconveniences for long-term benefits.

Key Lessons I Learned

  1. Convenience is not always secure

  2. Relying on a single platform is risky

  3. Layered security is essential

  4. Open-source tools offer greater trust

  5. Good habits matter as much as good tools

Switching to Bitwarden and Norton—and moving away from Google Password Manager—was more than just a technical decision. It was a mindset shift.

I moved from passive convenience to active security.

In a world where cyber threats are constantly evolving, taking control of your digital safety is no longer optional—it’s necessary. Whether you’re a student, developer, or everyday user, investing time in proper security tools can save you from major risks in the future.

For me, this journey has not only improved my security but also given me confidence and peace of mind. And that, more than anything, makes the switch worth it.

Wednesday, February 25, 2026

SD Card vs SSD: What’s Really Happening Inside Your Storage

 

We use SD cards in phones and cameras, and SSDs in laptops and PCs, almost without thinking. They both feel similar—fast, silent, and compact. But inside, they tell a very different story about how data is stored and how reliable that storage really is.

At the core, both SD cards and SSDs are built on NAND flash memory. This means your data isn’t stored on spinning disks or moving parts. Instead, it lives as electrical charge inside microscopic memory cells. When you save a file, what actually happens is that electrons are trapped inside tiny structures called floating gate transistors. Those trapped electrons represent binary data—your 0s and 1s.

This sounds efficient, and it is. But it also introduces a fundamental problem. These electrons don’t stay perfectly trapped forever. Over time, some of that charge leaks away. At the same time, each memory cell can only handle a limited number of write and erase operations, known as the Program/Erase cycle. So every time you write data, you are slightly wearing out the memory. This is true for both SD cards and SSDs, because they share the same underlying technology.

The difference begins in how each device deals with these weaknesses.

An SD card is designed to be small, cheap, and portable. Inside, it has a simple controller that handles basic read and write operations. It does its job, but it lacks sophistication. It doesn’t manage memory aggressively, and its ability to correct errors is limited. It also uses only basic forms of Wear leveling, which means some parts of the memory may be used more than others. Over time, those frequently used areas wear out faster. Combine that with charge leakage and the risk of sudden power loss during writing, and you get a storage device that is convenient but not highly reliable for long-term use.



An SSD, on the other hand, takes the same flash memory and builds a much more intelligent system around it. It includes a powerful controller that behaves almost like a mini processor. This controller constantly monitors the state of the memory, distributes writes evenly, corrects errors, and even replaces damaged cells using spare space that the user never sees. In effect, the SSD is actively fighting against the natural weaknesses of flash memory.

This is why two devices based on the same technology can behave so differently. The SD card is a straightforward implementation of flash storage, optimized for size and cost. The SSD is an engineered solution, designed to maximize reliability and performance despite the limitations of the underlying medium.

When you look at it this way, the real story isn’t just about storage devices. It’s about how engineering turns an imperfect technology into something dependable. Flash memory, by itself, is not entirely reliable. But with enough intelligence layered on top, as in an SSD, it becomes one of the most important storage solutions we use today.

So the next time you move a file from an SD card to an SSD, you’re not just copying data. You’re moving it from a simple storage system to a far more sophisticated one—where every bit is being carefully managed, protected, and preserved.

Image Ref.

1. https://arduino.stackexchange.com/
2. https://www.researchgate.net/

Thursday, February 12, 2026

1 John 3:6 Controversy (Bengali)

 (ā§Š:ā§Ŧ) ā§Ē-⧝ āĻĒāĻĻ āύি⧟ে āĻ…āύেāĻ• āĻŦিāϤāϰ্āĻ• āφāĻ›ে। āϏ্āĻĒāώ্āϟāϤāχ, AV (Authorized Version)-āĻ āϝেāĻ­াāĻŦে āĻāχ āĻ…ংāĻļāϟি āϰ⧟েāĻ›ে, āϤা āύāϤুāύ āύি⧟āĻŽে āĻĒāϰিāϤ্āϰাāĻŖ āϏāĻŽ্āĻŦāύ্āϧে āĻĒাāωāϞেāϰ āĻļিāĻ•্āώাāϰ āϏāĻ™্āĻ—ে āĻŽেāϞে āύা (āĻĻেāĻ–ুāύ ā§§ āĻ•āϰিāύ্āĻĨী⧟ ā§Ģ:ā§§-ā§Ģ; ā§§ā§§:ā§¨ā§Ž-ā§Šā§¨)। āϤাāχ āĻĒāĻŖ্āĻĄিāϤāϰা āĻ—্āϰীāĻ• āĻ­াāώা⧟ āĻ—ি⧟ে āĻāχ āĻĒāĻĻেāϰ āĻŦāϰ্āϤāĻŽাāύ āĻ•্āϰি⧟াāĻĒāĻĻ āĻ“ āĻŦāϰ্āϤāĻŽাāύ āĻ•্āϰি⧟াāĻŦাāϚāĻ• āĻŦিāĻļেāώāĻŖ (ÎŧέÎŊΉÎŊ, áŧÎŧÎąĪĪ„ÎŦÎŊÎĩΚ) āĻ•ে āĻ…āύুāĻŦাāĻĻ āĻ•āϰেāύ “āύিāϰāύ্āϤāϰ āĻ…āĻŦāϏ্āĻĨাāύ āĻ•āϰে” āĻāĻŦং “āύিāϰāύ্āϤāϰ āĻĒাāĻĒ āĻ•āϰে” āĻšিāϏেāĻŦে। āĻ•িāύ্āϤু āĻāϟি āĻ…āϏāĻ™্āĻ—āϤ, āĻ•াāϰāĻŖ ā§Ē āύāĻŽ্āĻŦāϰ āĻĒāĻĻেāϰ “committeth” (Ī€ÎŋΚáŋļÎŊ) āĻļāĻŦ্āĻĻāϟিāĻ“ āĻāĻ•āχ āĻ•াāϞে āϰ⧟েāĻ›ে। āφāĻĒāύি “āύিāϰāύ্āϤāϰ āĻĒাāĻĒ āϚāϰ্āϚা” āĻ•āϰāϞে āϤāĻŦেāχ āφāχāύ āϞāĻ™্āϘāύ āĻ•āϰেāύ—āĻāĻŽāύ āύ⧟। ā§Ē āύāĻŽ্āĻŦāϰ āĻĒāĻĻেāϰ āĻĻ্āĻŦিāϤী⧟ āĻ…ংāĻļ āĻĨেāĻ•ে āĻĒāϰিāώ্āĻ•াāϰ āϝে, āĻāĻ•āϟি āĻĒাāĻĒ āĻ•āϰāϞেāχ āφāĻĒāύি āφāχāύ āϞāĻ™্āϘāύ āĻ•āϰেāύ।

āφāϰ āϝāĻĻি ⧝ āύāĻŽ্āĻŦāϰ āĻĒāĻĻেāϰ āĻ•্āϰি⧟াāĻ—ুāϞি (Ī€ÎŋΚÎĩáŋ–, Î´ĪÎŊÎąĪ„ÎąÎš), āϝেāĻ—ুāϞিāĻ“ āĻāĻ•āχ āĻ•াāϞে āφāĻ›ে, āĻ…āύুāĻŦাāĻĻ āĻ•āϰেāύ “āύিāϰāύ্āϤāϰ āĻĒাāĻĒ āĻ•āϰāϤে āĻ…āĻ•্āώāĻŽ” āĻāĻŦং “āύিāϰāύ্āϤāϰ āĻĒাāĻĒ āϚāϰ্āϚা āĻ•āϰে āύা”—āϤাāĻšāϞে āϤা āĻ–্āϰিāϏ্āϟী⧟ āϜীāĻŦāύেāϰ āĻŦাāϏ্āϤāĻŦāϤা āĻĨেāĻ•ে āϏāĻŽ্āĻĒূāϰ্āĻŖ āĻŦিāϚ্āĻ›িāύ্āύ āĻšā§Ÿে āϝা⧟ (āϰোāĻŽী⧟ ā§­:⧧⧝)। āĻĒāĻŖ্āĻĄিāϤāĻĻেāϰ āĻāχ āĻšাāϏ্āϝāĻ•āϰ āĻĒ্āϰāϚেāώ্āϟা āφāϏāϞে āφāϤ্āĻŽāĻĒāĻ•্āώ āϏāĻŽāϰ্āĻĨāύ, āĻ•াāϰāĻŖ āϤাāϰা āĻ…āύ্āϝ āĻ–্āϰিāϏ্āϟাāύāĻĻেāϰ āĻŽāϤো āĻ•িāĻ›ু āĻŦিāĻļেāώ āϧāϰāύেāϰ āĻĒাāĻĒ āĻ•āϰে āύা; āĻ…āϰ্āĻĨাā§Ž: “āϤুāĻŽি āφāĻŽাāϰ āĻŽāϤো āϜীāĻŦāύāϝাāĻĒāύ āĻ•āϰো āύা, āϤাāχ āϤুāĻŽি āύিāĻļ্āϚ⧟āχ āĻĒāϰিāϤ্āϰাāĻŖāĻĒ্āϰাāĻĒ্āϤ āύāĻ“।”

āĻāĻ–āύ, āφāĻĒāύি ā§Ŧ āĻāĻŦং ⧝ āĻĒāĻĻāĻ•ে āĻ–্āϰিāϏ্āϟাāύেāϰ āĻ•্āώেāϤ্āϰে āĻāĻ­াāĻŦে āĻĒ্āϰ⧟োāĻ— āĻ•āϰāϤে āĻĒাāϰেāύ āϝে, āύāϤুāύ āĻŽাāύুāώ—āϝে āĻ…ংāĻļāϟি “āψāĻļ্āĻŦāϰ āĻĨেāĻ•ে āϜāύ্āĻŽāĻ—্āϰāĻšāĻŖ āĻ•āϰেāĻ›ে” (āĻĒāĻĻ ā§¯)—āϏে āĻĒাāĻĒ āĻ•āϰে āύা; āĻĒাāĻĒ āĻ•āϰে āĻĒুāϰোāύো āϏ্āĻŦāĻ­াāĻŦ, āϝে āϏ্āĻŦāĻ­াāĻŦ āĻļ⧟āϤাāύেāϰ āĻ…āϧীāύ (āĻĒāĻĻ ā§Ž) (āĻĻেāĻ–ুāύ āϰোāĻŽী⧟ ā§­:⧧⧝-⧍ā§Ļ)।

āĻ•িāύ্āϤু āϤাāϤেāĻ“ āĻāχ āĻ…ংāĻļেāϰ āϏāĻŦ āϏāĻŽāϏ্āϝাāϰ āϏāĻŽ্āĻĒূāϰ্āĻŖ āϏāĻŽাāϧাāύ āĻšā§Ÿ āύা। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ “āϧাāϰ্āĻŽিāĻ• āĻ•াāϜ” āĻ•āϰাāϰ āĻ•াāϰāĻŖে āϧাāϰ্āĻŽিāĻ• āύ⧟ (āĻĒāĻĻ ā§­); āϤিāύি āϧাāϰ্āĻŽিāĻ•, āĻ•াāϰāĻŖ āϤিāύি āĻ–্āϰিāϏ্āϟেāϰ “āϧাāϰ্āĻŽিāĻ•āϤা” āĻ—্āϰāĻšāĻŖ āĻ•āϰেāĻ›েāύ (āϰোāĻŽী⧟ ā§§ā§Ļ:ā§Š-ā§Ē; āĻĢিāϞিāĻĒী⧟ ā§Š:ā§Ž-⧝)। āφāϰ āĻ•োāύো āĻ–্āϰিāϏ্āϟাāύāχ āϤাঁāĻ•ে “āĻĻেāĻ–েāύি”—āϏে āĻ–্āϰিāϏ্āϟে āĻ…āĻŦāϏ্āĻĨাāύ āĻ•āϰুāĻ• āĻŦা āĻĒাāĻĒ āύা āĻ•āϰুāĻ• (ā§§ āĻĒিāϤāϰ ā§§:ā§Ž; āϝোāĻšāύ ⧍ā§Ļ:⧍⧝)।

āĻļাāϏ্āϤ্āϰী⧟ (doctrinal)āĻ­াāĻŦে, āĻāĻ–াāύে āφāĻĒāύি āĻŽāĻšাāĻ•্āϞেāĻļেāϰ (Tribulation) āĻļেāώ āϏāĻŽā§Ÿেāϰ āĻāĻ•āϟি āĻĒāϰিāϏ্āĻĨিāϤিāϤে āφāĻ›েāύ। ā§­ āύāĻŽ্āĻŦāϰ āĻĒāĻĻāϟি āϏ্āĻĒāώ্āϟāϤāχ āĻŽāĻšাāĻ•্āϞেāĻļেāϰ āĻŦিāĻļ্āĻŦাāϏ-āĻ“-āĻ•āϰ্āĻŽ (faith-and-works) āĻĒāĻĻ্āϧāϤিāϰ āĻ•āĻĨা āĻŦāϞāĻ›ে (āĻĒ্āϰāĻ•াāĻļিāϤ āĻŦাāĻ•্āϝ ⧧⧍:ā§§ā§­; ā§§ā§Ē:⧧⧍)। āϏুāϤāϰাং āĻāĻ–াāύে “āĻ…āĻŦāϏ্āĻĨাāύ āĻ•āϰা” āĻŽাāύে āĻšāϞো āĻŽāĻšাāĻ•্āϞেāĻļেāϰ āϏাāϧু āĻŦ্āϝāĻ•্āϤি āϏāĻ•্āϰি⧟āĻ­াāĻŦে āĻ–্āϰিāϏ্āϟে āĻ…āĻŦāϏ্āĻĨাāύ āĻ•āϰে āĻĨাāĻ•া āĻŽāĻšাāĻ•্āϞেāĻļেāϰ āĻļেāώ āĻĒāϰ্āϝāύ্āϤ (āĻŽāĻĨি ⧍ā§Ē:ā§§ā§Š; āχāĻŦ্āϰী⧟ ā§Š:ā§Ŧ, ā§§ā§Ē); āĻāϟি āĻ–্āϰিāϏ্āϟাāύāĻ•ে āĻĒāĻŦিāϤ্āϰ āφāϤ্āĻŽা āĻĻ্āĻŦাāϰা āĻ–্āϰিāϏ্āϟেāϰ āĻĻেāĻšে āϏীāϞāĻŽোāĻšāϰ āĻ•āϰা āύ⧟ (āχāĻĢিāώী⧟ ā§Ē:ā§Šā§Ļ; ā§§:ā§§ā§Š-ā§§ā§Ē)।

āĻāχ āĻĒāĻĻেāϰ “āĻĒ্āϰāĻ­ুāĻ•ে āĻĻেāĻ–া” āĻŦāϞāϤে āĻŦোāĻা⧟, āĻŽāĻšাāĻ•্āϞেāĻļেāϰ āĻļেāώে āĻĒ্āϰāĻ­ুāϰ āϏেāχ āϏাāϧুāĻĻেāϰ āĻ•াāĻ›ে āφāĻŦিāϰ্āĻ­ূāϤ āĻšāĻ“ā§Ÿা, āϝাāϰা āϤাঁāϰ āϜāύ্āϝ āĻ…āĻĒেāĻ•্āώা āĻ•āϰāĻ›ে (āχāĻŦ্āϰী⧟ ⧝:⧍ā§Ŧ; ⧧⧍:ā§§ā§Ē; āĻŽāĻĨি ⧍ā§Ē:ā§Ģā§Ļ)।

(āϝাāĻ•োāĻŦ ā§Ģ:⧧⧍) āĻāĻŦং “āĻŽূāϰ্āϤি” (ā§§ āϝোāĻšāύ ā§Ģ:⧍⧧)। āĻāχ āĻ…ংāĻļে āϝে “āĻĒাāĻĒ”-āĻāϰ āĻ•āĻĨা āĻŦāϞা āĻšā§ŸেāĻ›ে, āϤা āĻāĻ•āϟি āύিāϰ্āĻĻিāώ্āϟ āĻĒাāĻĒ (ā§§ āϝোāĻšāύ ā§Ģ:ā§§ā§Ŧ), āϝা āĻāĻ•āϟি “āĻļāĻĒāĻĨ”-āĻāϰ āϏāĻ™্āĻ—ে āϏāĻŽ্āĻĒāϰ্āĻ•িāϤ—āϝেāĻ–াāύে āĻ•েāω āϧāϰ্āĻŽāϤ্āϝাāĻ— āĻ•āϰে āĻĒāĻļুāϰ āϚিāĻš্āύ āĻ—্āϰāĻšāĻŖ āĻ•āϰে āĻāĻŦং āϤাāϰ āĻŽূāϰ্āϤিāϰ āωāĻĒাāϏāύা āĻ•āϰে (āĻĒ্āϰāĻ•াāĻļিāϤ āĻŦাāĻ•্āϝ ā§§ā§Š-ā§§ā§Ē-ā§§ā§Ž; ā§§ā§Ē:ā§§ā§§)।

Read Letters of Paul in just 28 Days

 āĻŦাāχāĻŦেāϞ āϏ্āϟাāĻĄি āĻ•āϰাāϰ āχāϚ্āĻ›ে āĻĨাāĻ•āϞে āφāĻĒāύি āϏেāϟা āĻ•āϰāϤে āĻĒাāϰেāύ:- 

āĻŽাāϤ্āϰ ā§¨ā§Ž āĻĻিāύে āĻĒāϞেāϰ āĻĒāϤ্āϰāĻ—ুāϞি āĻĒāĻĄ়ে āĻĢেāϞুāύ:- 

ā§§. āϰোāĻŽাāύāϏ্ ā§§-ā§Š

⧍. āϰোāĻŽাāύāϏ্ ā§Ē-ā§Ŧ

ā§Š. āϰোāĻŽাāύāϏ্ ā§­-⧝

ā§Ē. āϰোāĻŽাāύāϏ্ ā§§ā§Ļ-⧧⧍

ā§Ģ. āϰোāĻŽাāύāϏ্ ā§§ā§Š-ā§§ā§Ŧ

ā§Ŧ. ā§§āĻŽ āĻ•āϰিāύ্āĻĨীāϝ় ā§§-ā§Š

ā§­. ā§§āĻŽ āĻ•āϰিāύ্āĻĨীāϝ় ā§Ē-ā§Ŧ

ā§Ž. ā§§āĻŽ āĻ•āϰিāύ্āĻĨীāϝ় ā§­-⧝

⧝. ā§§āĻŽ āĻ•āϰিāύ্āĻĨীāϝ় ā§§ā§Ļ-⧧⧍

ā§§ā§Ļ. ā§§āĻŽ āĻ•āϰিāύ্āĻĨীāϝ় ā§§ā§Š-ā§§ā§Ŧ

ā§§ā§§. ⧍⧟ āĻ•āϰিāύ্āĻĨী⧟ ā§§-ā§Š

⧧⧍. ⧍⧟ āĻ•āϰিāύ্āĻĨী⧟ ā§Ē-ā§Ŧ

ā§§ā§Š. ⧍⧟ āĻ•āϰিāύ্āĻĨী⧟ ā§­-⧝

ā§§ā§Ē. ⧍⧟ āĻ•āϰিāύ্āĻĨী⧟ ā§§ā§Ļ-ā§§ā§Š

ā§§ā§Ģ. āĻ—াāϞাāϤীāϝ় ā§§-ā§Š

ā§§ā§Ŧ. āĻ—াāϞাāϤীāϝ় ā§Ē-ā§Ŧ

ā§§ā§­. āχāĻĢিāώীāϝ় ā§§-ā§Š

ā§§ā§Ž. āχāĻĢিāώীāϝ় ā§Ē-ā§Ŧ

⧧⧝. āĻĢিāϞিāĻĒীāϝ় ā§§-ā§Ē

⧍ā§Ļ. āĻ•āϞāϏীāϝ় ā§§-ā§Ē

⧍⧧. ā§§āĻŽ āĻĨিāώāϞāύীāĻ•ীāϝ় ā§§-ā§Š

⧍⧍. ā§§āĻŽ āĻĨিāώāϞāύীāĻ•ীāϝ় ā§Ē-ā§Ģ

ā§¨ā§Š. ⧍⧟ āĻĨিāώāϞāύীāĻ•ী⧟ ā§§-ā§Š

⧍ā§Ē. ā§§āĻŽ āϤীāĻŽāĻĨিāϝ় ā§§-ā§Š

⧍ā§Ģ. ā§§āĻŽ āϤীāĻŽāĻĨিāϝ় ā§Ē-ā§Ŧ

⧍ā§Ŧ. ⧍⧟ āϤীāĻŽāĻĨি⧟ ā§§-ā§Ē

27. āϟাāχāϟাāϏ

28. āĻĢিāϞেāĻŽāύ

Can a Christian lose salvation? (English)

 First, the term Christian must be defined. A “Christian” is not a person who has said a prayer or walked down an aisle or been raised in a Christian family. While each of these things can be a part of the Christian experience, they are not what makes a Christian. A Christian is a person who has fully trusted in Jesus Christ as the only Savior and therefore possesses the Holy Spirit (John 3:16; Acts 16:31; Ephesians 2:8–9).

So, with this definition in mind, can a Christian lose salvation? It’s a crucially important question. Perhaps the best way to answer it is to examine what the Bible says occurs at salvation and to study what losing salvation would entail:

A Christian is a new creation. “Therefore, if anyone is in Christ, the new creation has come: The old has gone, the new is here!” (2 Corinthians 5:17). A Christian is not simply an “improved” version of a person; a Christian is an entirely new creature. He is “in Christ.” For a Christian to lose salvation, the new creation would have to be destroyed.

A Christian is redeemed. “For you know that it was not with perishable things such as silver or gold that you were redeemed from the empty way of life handed down to you from your ancestors, but with the precious blood of Christ, a lamb without blemish or defect” (1 Peter 1:18–19). The word redeemed refers to a purchase being made, a price being paid. We were purchased at the cost of Christ’s death. For a Christian to lose salvation, God Himself would have to revoke His purchase of the individual for whom He paid with the precious blood of Christ.

A Christian is justified. “Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ” (Romans 5:1). To justify is to declare righteous. All those who receive Jesus as Savior are “declared righteous” by God. For a Christian to lose salvation, God would have to go back on His Word and “un-declare” what He had previously declared. Those absolved of guilt would have to be tried again and found guilty. God would have to reverse the sentence handed down from the divine bench.

A Christian is promised eternal life. “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life” (John 3:16). Eternal life is the promise of spending forever in heaven with God. God promises that if you believe, you will have eternal life. For a Christian to lose salvation, eternal life would have to be redefined. The Christian is promised to live forever. Does eternal not mean “eternal”?

A Christian is marked by God and sealed by the Spirit. “You also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory” (Ephesians 1:13–14). At the moment of faith, the new Christian is marked and sealed with the Spirit, who was promised to act as a deposit to guarantee the heavenly inheritance. The end result is that God’s glory is praised. For a Christian to lose salvation, God would have to erase the mark, withdraw the Spirit, cancel the deposit, break His promise, revoke the guarantee, keep the inheritance, forego the praise, and lessen His glory.

A Christian is guaranteed glorification. “Those he predestined, he also called; those he called, he also justified; those he justified, he also glorified” (Romans 8:30). According to Romans 5:1, justification is ours at the moment of faith. According to Romans 8:30, glorification comes with justification. All those whom God justifies are promised to be glorified. This promise will be fulfilled when Christians receive their perfect resurrection bodies in heaven. If a Christian can lose salvation, then Romans 8:30 is in error, because God could not guarantee glorification for all those whom He predestines, calls, and justifies.

A Christian cannot lose salvation. Most, if not all, of what the Bible says happens to us when we receive Christ would be invalidated if salvation could be lost. Salvation is the gift of God, and God’s gifts are “irrevocable” (Romans 11:29). A Christian cannot be un-newly created. The redeemed cannot be unpurchased. Eternal life cannot be temporary. God cannot renege on His Word. Scripture says that God does not lie (Titus 1:2).

Two common objections to the belief that a Christian cannot lose salvation concern these experiential issues: 1) What about Christians who live in a sinful, unrepentant lifestyle? 2) What about Christians who reject the faith and deny Christ? The problem with these objections is the assumption that everyone who calls himself a “Christian” has actually been born again. The Bible declares that a true Christian will not live a state of continual, unrepentant sin (1 John 3:6). The Bible also says that anyone who departs the faith is demonstrating that he was never truly a Christian (1 John 2:19). He may have been religious, he may have put on a good show, but he was never born again by the power of God. “By their fruit you will recognize them” (Matthew 7:16). The redeemed of God belong “to him who was raised from the dead, in order that we might bear fruit for God” (Romans 7:4).

Nothing can separate a child of God from the Father’s love (Romans 8:38–39). Nothing can remove a Christian from God’s hand (John 10:28–29). God guarantees eternal life and maintains the salvation He has given us. The Good Shepherd searches for the lost sheep, and, “when he finds it, he joyfully puts it on his shoulders and goes home” (Luke 15:5–6). The lamb is found, and the Shepherd gladly bears the burden; our Lord takes full responsibility for bringing the lost one safely home.

Jude 1:24–25 further emphasizes the goodness and faithfulness of our Savior: “To him who is able to keep you from stumbling and to present you before his glorious presence without fault and with great joy—to the only God our Savior be glory, majesty, power and authority, through Jesus Christ our Lord, before all ages, now and forevermore! Amen.”

Can a Christian lose salvation? (Bengali)

 āĻĒ্āϰāĻĨāĻŽেāχ “āĻ–্āϰিāϏ্āϟাāύ” āĻļāĻŦ্āĻĻāϟিāϰ āϏংāϜ্āĻžা āύিāϰ্āϧাāϰāĻŖ āĻ•āϰা āĻĻāϰāĻ•াāϰ। āĻāĻ•āϜāύ “āĻ–্āϰিāϏ্āϟাāύ” āϏেāχ āĻŦ্āϝāĻ•্āϤি āύāύ āϝিāύি āĻļুāϧু āĻāĻ•āϟি āĻĒ্āϰাāϰ্āĻĨāύা āĻ•āϰেāĻ›েāύ, āĻŦা āĻ—িāϰ্āϜাāϰ āϏাāĻŽāύে āĻ—ি⧟ে āĻĻাঁ⧜ি⧟েāĻ›েāύ, āĻŦা āĻ–্āϰিāϏ্āϟাāύ āĻĒāϰিāĻŦাāϰে āϜāύ্āĻŽেāĻ›েāύ। āĻāϏāĻŦ āĻŦিāώ⧟ āĻ–্āϰিāϏ্āϟী⧟ āĻ…āĻ­িāϜ্āĻžāϤাāϰ āĻ…ংāĻļ āĻšāϤে āĻĒাāϰে, āĻ•িāύ্āϤু āĻāĻ—ুāϞোāχ āĻ•াāωāĻ•ে āĻ–্āϰিāϏ্āϟাāύ āĻ•āϰে āύা। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻšāϞেāύ āϏেāχ āĻŦ্āϝāĻ•্āϤি, āϝিāύি āϏāĻŽ্āĻĒূāϰ্āĻŖāĻ­াāĻŦে āϝীāĻļু āĻ–্āϰিāϏ্āϟেāϰ āωāĻĒāϰ āĻāĻ•āĻŽাāϤ্āϰ āωāĻĻ্āϧাāϰāĻ•āϰ্āϤা āĻšিāϏেāĻŦে āĻŦিāĻļ্āĻŦাāϏ āϏ্āĻĨাāĻĒāύ āĻ•āϰেāĻ›েāύ āĻāĻŦং āϤাāχ āĻĒāĻŦিāϤ্āϰ āφāϤ্āĻŽা āϞাāĻ­ āĻ•āϰেāĻ›েāύ (āϝোāĻšāύ ā§Š:ā§§ā§Ŧ; āĻĒ্āϰেāϰিāϤ ā§§ā§Ŧ:ā§Šā§§; āχāĻĢিāϏী⧟ ⧍:ā§Ž–⧝)।

āϏুāϤāϰাং āĻāχ āϏংāϜ্āĻžাāϰ āφāϞোāĻ•ে āĻĒ্āϰāĻļ্āύ āφāϏে—āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻ•ি āϤাāϰ āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে? āĻāϟি āĻ…āϤ্āϝāύ্āϤ āĻ—ুāϰুāϤ্āĻŦāĻĒূāϰ্āĻŖ āĻāĻ•āϟি āĻĒ্āϰāĻļ্āύ। āϏāĻŽ্āĻ­āĻŦāϤ āĻāϰ āωāϤ্āϤāϰেāϰ āϏāĻŦāϚে⧟ে āĻ­াāϞো āωāĻĒা⧟ āĻšāϞো, āĻŦাāχāĻŦেāϞ āĻĒāϰিāϤ্āϰাāĻŖেāϰ āϏāĻŽā§Ÿ āĻ•ী āϘāϟে āϤা āĻĻেāĻ–া āĻāĻŦং āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāύো āĻŦāϞāϤে āĻ•ী āĻŦোāĻা⧟ āϤা āĻŦোāĻা:

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻāĻ•āϟি āύāϤুāύ āϏৃāώ্āϟি। “āĻ…āϤāĻāĻŦ āĻ•েāω āϝāĻĻি āĻ–্āϰিāϏ্āϟে āĻĨাāĻ•ে, āϤāĻŦে āϏে āύāϤুāύ āϏৃāώ্āϟি; āĻĒুāϰোāύো āϏāĻŦ āĻ•িāĻ›ু āϚāϞে āĻ—েāĻ›ে, āĻĻেāĻ–ো, āύāϤুāύ āϏāĻŦ āĻ•িāĻ›ু āĻāϏেāĻ›ে!” (⧍ āĻ•āϰিāύ্āĻĨী⧟ ā§Ģ:ā§§ā§­)। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻ•েāĻŦāϞ āĻāĻ•āϜāύ āĻŽাāύুāώেāϰ “āωāύ্āύāϤ āϏংāϏ্āĻ•āϰāĻŖ” āύāύ; āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϏāĻŽ্āĻĒূāϰ্āĻŖ āύāϤুāύ āĻāĻ• āϏāϤ্āϤা। āϏে “āĻ–্āϰিāϏ্āϟে” āϰ⧟েāĻ›ে। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϝāĻĻি āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে, āϤāĻŦে āĻāχ āύāϤুāύ āϏৃāώ্āϟিāĻ•ে āϧ্āĻŦংāϏ āĻšāϤে āĻšāĻŦে।

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻŽুāĻ•্āϤিāĻĻাāύāĻĒ্āϰাāĻĒ্āϤ। “āĻ•াāϰāĻŖ āϤোāĻŽāϰা āϜাāύো āϝে āϤোāĻŽাāĻĻেāϰ āĻĒিāϤৃāĻĒুāϰুāώāĻĻেāϰ āĻ•াāĻ› āĻĨেāĻ•ে āĻĒ্āϰাāĻĒ্āϤ āύিāώ্āĻĢāϞ āϜীāĻŦāύāϧাāϰা āĻĨেāĻ•ে āϤোāĻŽāϰা āĻŽুāĻ•্āϤিāĻĻাāύāĻĒ্āϰাāĻĒ্āϤ āĻšā§ŸেāĻ›, āϤা āϰূāĻĒা āĻŦা āϏোāύাāϰ āĻŽāϤো āύāĻļ্āĻŦāϰ āĻŦāϏ্āϤু āĻĻি⧟ে āύ⧟, āĻŦāϰং āĻ–্āϰিāϏ্āϟেāϰ āĻ…āĻŽূāϞ্āϝ āϰāĻ•্āϤ āĻĻ্āĻŦাāϰা, āϝিāύি āĻ›িāϞেāύ āύিāώ্āĻ•āϞāĻ™্āĻ• āĻ“ āύিāϰ্āĻĻোāώ āĻŽেāώāĻļাāĻŦāĻ•” (ā§§ āĻĒিāϤāϰ ā§§:ā§§ā§Ž–⧧⧝)। “āĻŽুāĻ•্āϤিāĻĻাāύ” āĻļāĻŦ্āĻĻāϟিāϰ āĻ…āϰ্āĻĨ āĻšāϞো āĻŽূāϞ্āϝ āĻĻি⧟ে āĻ•্āϰ⧟ āĻ•āϰা। āφāĻŽāϰা āĻ–্āϰিāϏ্āϟেāϰ āĻŽৃāϤ্āϝুāϰ āĻŽূāϞ্āϝে āĻ•্āϰ⧟িāϤ āĻšā§ŸেāĻ›ি। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϝāĻĻি āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে, āϤāĻŦে āψāĻļ্āĻŦāϰāĻ•েāχ āϏেāχ āĻ•্āϰ⧟ āĻŦাāϤিāϞ āĻ•āϰāϤে āĻšāĻŦে, āϝাāϰ āĻŽূāϞ্āϝ āϤিāύি āĻ–্āϰিāϏ্āϟেāϰ āĻ…āĻŽূāϞ্āϝ āϰāĻ•্āϤ āĻĻি⧟ে āĻĻি⧟েāĻ›েāύ।

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ। “āĻ…āϤāĻāĻŦ āφāĻŽāϰা āĻŦিāĻļ্āĻŦাāϏেāϰ āĻĻ্āĻŦাāϰা āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻšā§ŸেāĻ›ি āĻŦāϞে āφāĻŽাāĻĻেāϰ āĻĒ্āϰāĻ­ু āϝীāĻļু āĻ–্āϰিāϏ্āϟেāϰ āĻŽাāϧ্āϝāĻŽে āψāĻļ্āĻŦāϰেāϰ āϏāĻ™্āĻ—ে āĻļাāύ্āϤি āϞাāĻ­ āĻ•āϰেāĻ›ি” (āϰোāĻŽী⧟ ā§Ģ:ā§§)। “āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻ•āϰা” āĻŽাāύে āĻšāϞো āϧাāϰ্āĻŽিāĻ• āĻŦāϞে āϘোāώāĻŖা āĻ•āϰা। āϝাāϰা āϝীāĻļুāĻ•ে āωāĻĻ্āϧাāϰāĻ•āϰ্āϤা āĻšিāϏেāĻŦে āĻ—্āϰāĻšāĻŖ āĻ•āϰে, āϤাāĻĻেāϰ āϏāĻŦাāχāĻ•ে āψāĻļ্āĻŦāϰ “āϧাāϰ্āĻŽিāĻ• āĻŦāϞে āϘোāώāĻŖা āĻ•āϰেāύ।” āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϝāĻĻি āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে, āϤāĻŦে āψāĻļ্āĻŦāϰāĻ•ে āϤাঁāϰ āĻŦাāĻ•্āϝ āĻĢিāϰি⧟ে āύিāϤে āĻšāĻŦে āĻāĻŦং āφāĻ—ে āϝে āϘোāώāĻŖা āϤিāύি āĻ•āϰেāĻ›িāϞেāύ, āϤা “āĻ…āϘোāώিāϤ” āĻ•āϰāϤে āĻšāĻŦে। āϝাāĻĻেāϰ āĻ…āĻĒāϰাāϧāĻŽুāĻ•্āϤ āϘোāώāĻŖা āĻ•āϰা āĻšā§ŸেāĻ›িāϞ, āϤাāĻĻেāϰ āφāĻŦাāϰ āĻŦিāϚাāϰ āĻ•āϰে āĻĻোāώী āϏাāĻŦ্āϝāϏ্āϤ āĻ•āϰāϤে āĻšāĻŦে। āψāĻļ্āĻŦāϰāĻ•ে āϤাঁāϰ āĻĻেāĻ“ā§Ÿা āϰা⧟ āĻŦাāϤিāϞ āĻ•āϰāϤে āĻšāĻŦে।

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻ…āύāύ্āϤ āϜীāĻŦāύেāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āĻĒে⧟েāĻ›ে। “āĻ•াāϰāĻŖ āψāĻļ্āĻŦāϰ āϜāĻ—āϤāĻ•ে āĻāĻŽāύ āĻ­াāϞোāĻŦাāϏāϞেāύ āϝে āϤিāύি āϤাঁāϰ āĻāĻ•āĻŽাāϤ্āϰ āĻĒুāϤ্āϰāĻ•ে āĻĻিāϞেāύ, āϝেāύ āϝে āĻ•েāω āϤাঁāϰ āωāĻĒāϰ āĻŦিāĻļ্āĻŦাāϏ āĻ•āϰে āϏে āĻŦিāύāώ্āϟ āύা āĻšā§Ÿ, āĻŦāϰং āĻ…āύāύ্āϤ āϜীāĻŦāύ āĻĒা⧟” (āϝোāĻšāύ ā§Š:ā§§ā§Ŧ)। āĻ…āύāύ্āϤ āϜীāĻŦāύ āĻšāϞো āψāĻļ্āĻŦāϰেāϰ āϏāĻ™্āĻ—ে āϏ্āĻŦāϰ্āĻ—ে āϚিāϰāĻ•াāϞ āĻĨাāĻ•াāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি। āψāĻļ্āĻŦāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āĻĻেāύ āϝে, āϝāĻĻি āϤুāĻŽি āĻŦিāĻļ্āĻŦাāϏ āĻ•āϰো, āϤāĻŦে āϤুāĻŽি āĻ…āύāύ্āϤ āϜীāĻŦāύ āĻĒাāĻŦে। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϝāĻĻি āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে, āϤāĻŦে āĻ…āύāύ্āϤ āϜীāĻŦāύāĻ•ে āύāϤুāύ āĻ•āϰে āϏংāϜ্āĻžা⧟িāϤ āĻ•āϰāϤে āĻšāĻŦে। āĻ–্āϰিāϏ্āϟাāύāĻ•ে āϚিāϰāĻ•াāϞ āĻŦাঁāϚাāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āĻĻেāĻ“ā§Ÿা āĻšā§ŸেāĻ›ে। “āĻ…āύāύ্āϤ” āĻ•ি āϤāĻŦে āφāϰ “āĻ…āύāύ্āϤ” āĻĨাāĻ•ে āύা?

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āψāĻļ্āĻŦāϰেāϰ āĻĻ্āĻŦাāϰা āϚিāĻš্āύিāϤ āĻ“ āφāϤ্āĻŽাāϰ āĻĻ্āĻŦাāϰা āϏীāϞāĻŽোāĻšāϰāĻĒ্āϰাāĻĒ্āϤ। “āϤোāĻŽāϰাāĻ“ āĻ–্āϰিāϏ্āϟে āĻ…āύ্āϤāϰ্āĻ­ুāĻ•্āϤ āĻšāϞে āϝāĻ–āύ āϤোāĻŽāϰা āϏāϤ্āϝেāϰ āĻŦাāĻ•্āϝ, āĻ…āϰ্āĻĨাā§Ž āϤোāĻŽাāĻĻেāϰ āĻĒāϰিāϤ্āϰাāĻŖেāϰ āϏুāϏāĻŽাāϚাāϰ āĻļুāύāϞে। āĻŦিāĻļ্āĻŦাāϏ āĻ•āϰাāϰ āĻĒāϰ āϤোāĻŽāϰা āĻĒ্āϰāϤিāĻļ্āϰুāϤ āĻĒāĻŦিāϤ্āϰ āφāϤ্āĻŽাāϰ āĻĻ্āĻŦাāϰা āϤাঁāϰ āĻŽāϧ্āϝে āϏীāϞāĻŽোāĻšāϰāĻĒ্āϰাāĻĒ্āϤ āĻšāϞে, āϝিāύি āφāĻŽাāĻĻেāϰ āωāϤ্āϤāϰাāϧিāĻ•াāϰেāϰ āϜাāĻŽাāύāϤ, āϝāϤāĻ•্āώāĻŖ āύা āψāĻļ্āĻŦāϰেāϰ āĻ…āϧিāĻ•াāϰāĻ­ুāĻ•্āϤāĻĻেāϰ āĻŽুāĻ•্āϤি āϏāĻŽ্āĻĒূāϰ্āĻŖ āĻšā§Ÿ—āϤাঁāϰ āĻŽāĻšিāĻŽাāϰ āĻĒ্āϰāĻļংāϏাāϰ āϜāύ্āϝ” (āχāĻĢিāϏী⧟ ā§§:ā§§ā§Š–ā§§ā§Ē)। āĻŦিāĻļ্āĻŦাāϏেāϰ āĻŽুāĻšূāϰ্āϤে āύāϤুāύ āĻ–্āϰিāϏ্āϟাāύ āφāϤ্āĻŽাāϰ āĻĻ্āĻŦাāϰা āϚিāĻš্āύিāϤ āĻ“ āϏীāϞāĻŽোāĻšāϰāĻĒ্āϰাāĻĒ্āϤ āĻšā§Ÿ, āϝিāύি āϏ্āĻŦāϰ্āĻ—ী⧟ āωāϤ্āϤāϰাāϧিāĻ•াāϰেāϰ āύিāĻļ্āϚ⧟āϤা āĻšিāϏেāĻŦে āϜাāĻŽাāύāϤ। āĻāϰ āĻļেāώ āĻĢāϞ āĻšāϞো—āψāĻļ্āĻŦāϰেāϰ āĻŽāĻšিāĻŽাāϰ āĻĒ্āϰāĻļংāϏা। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āϝāĻĻি āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে, āϤāĻŦে āψāĻļ্āĻŦāϰāĻ•ে āϏেāχ āϚিāĻš্āύ āĻŽুāĻ›ে āĻĢেāϞāϤে āĻšāĻŦে, āφāϤ্āĻŽাāĻ•ে āĻĒ্āϰāϤ্āϝাāĻšাāϰ āĻ•āϰāϤে āĻšāĻŦে, āϜাāĻŽাāύāϤ āĻŦাāϤিāϞ āĻ•āϰāϤে āĻšāĻŦে, āϤাঁāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āĻ­াāĻ™āϤে āĻšāĻŦে, āύিāĻļ্āϚ⧟āϤা āĻĒ্āϰāϤ্āϝাāĻšাāϰ āĻ•āϰāϤে āĻšāĻŦে, āωāϤ্āϤāϰাāϧিāĻ•াāϰ āϰেāĻ–ে āĻĻিāϤে āĻšāĻŦে, āĻĒ্āϰāĻļংāϏা āϤ্āϝাāĻ— āĻ•āϰāϤে āĻšāĻŦে āĻāĻŦং āϤাঁāϰ āĻŽāĻšিāĻŽা āĻš্āϰাāϏ āĻĒাāĻŦে।

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻ—ৌāϰāĻŦāĻĒ্āϰাāĻĒ্āϤিāϰ āύিāĻļ্āϚ⧟āϤা āĻĒে⧟েāĻ›ে। “āϝাāĻĻেāϰ āϤিāύি āĻĒূāϰ্āĻŦāύিāϰ্āϧাāϰিāϤ āĻ•āϰেāĻ›েāύ, āϤাāĻĻেāϰ āϤিāύি āĻĄাāĻ•āϞেāύ; āϝাāĻĻেāϰ āĻĄাāĻ•āϞেāύ, āϤাāĻĻেāϰ āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻ•āϰāϞেāύ; āφāϰ āϝাāĻĻেāϰ āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻ•āϰāϞেāύ, āϤাāĻĻেāϰ āĻ—ৌāϰāĻŦাāύ্āĻŦিāϤāĻ“ āĻ•āϰāϞেāύ” (āϰোāĻŽী⧟ ā§Ž:ā§Šā§Ļ)। āϰোāĻŽী⧟ ā§Ģ:ā§§ āĻ…āύুāϝা⧟ী, āĻŦিāĻļ্āĻŦাāϏেāϰ āĻŽুāĻšূāϰ্āϤেāχ āφāĻŽāϰা āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻšāχ। āϰোāĻŽী⧟ ā§Ž:ā§Šā§Ļ āĻ…āύুāϝা⧟ী, āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻšāĻ“ā§Ÿাāϰ āϏāĻ™্āĻ—ে āϏāĻ™্āĻ—েāχ āĻ—ৌāϰāĻŦāĻĒ্āϰাāĻĒ্āϤিāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āϰ⧟েāĻ›ে। āϝাāĻĻেāϰ āψāĻļ্āĻŦāϰ āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āĻ•āϰেāύ, āϤাāĻĻেāϰ āϏāĻŦাāχāĻ•ে āĻ—ৌāϰāĻŦাāύ্āĻŦিāϤ āĻ•āϰাāϰ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āĻĻেāĻ“ā§Ÿা āĻšā§ŸেāĻ›ে। āĻāχ āĻĒ্āϰāϤিāĻļ্āϰুāϤি āĻĒূāϰ্āĻŖ āĻšāĻŦে āϝāĻ–āύ āĻ–্āϰিāϏ্āϟাāύāϰা āϏ্āĻŦāϰ্āĻ—ে āϤাāĻĻেāϰ āĻĒāϰিāĻĒূāϰ্āĻŖ āĻĒুāύāϰুāϤ্āĻĨিāϤ āĻĻেāĻš āĻĒাāĻŦে। āϝāĻĻি āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে, āϤāĻŦে āϰোāĻŽী⧟ ā§Ž:ā§Šā§Ļ āĻ­ুāϞ āĻšā§Ÿে āϝা⧟, āĻ•াāϰāĻŖ āψāĻļ্āĻŦāϰ āϤāĻ–āύ āĻĒূāϰ্āĻŦāύিāϰ্āϧাāϰিāϤ, āφāĻš্āĻŦাāύāĻĒ্āϰাāĻĒ্āϤ āĻ“ āϧাāϰ্āĻŽিāĻ• āĻ—āĻŖ্āϝ āϏāĻ•āϞেāϰ āϜāύ্āϝ āĻ—ৌāϰāĻŦāĻĒ্āϰাāĻĒ্āϤি āύিāĻļ্āϚিāϤ āĻ•āϰāϤে āĻĒাāϰāĻŦেāύ āύা।

āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে āύা। āĻŦাāχāĻŦেāϞ āφāĻŽাāĻĻেāϰ āĻŦāϞে āϝে, āĻ–্āϰিāϏ্āϟ āĻ—্āϰāĻšāĻŖ āĻ•āϰাāϰ āϏāĻŽā§Ÿ āφāĻŽাāĻĻেāϰ āϏāĻ™্āĻ—ে āϝা āϘāϟে, āϤাāϰ āĻŦেāĻļিāϰāĻ­াāĻ—āχ āĻ…āϰ্āĻĨāĻšীāύ āĻšā§Ÿে āϝাāĻŦে āϝāĻĻি āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāύো āϏāĻŽ্āĻ­āĻŦ āĻšā§Ÿ। āĻĒāϰিāϤ্āϰাāĻŖ āĻšāϞো āψāĻļ্āĻŦāϰেāϰ āĻĻাāύ, āĻāĻŦং āψāĻļ্āĻŦāϰেāϰ āĻĻাāύ “āĻ…āĻĒ্āϰāϤ্āϝাāĻšাāϰāϝোāĻ—্āϝ” (āϰোāĻŽী⧟ ā§§ā§§:⧍⧝)। āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āφāĻŦাāϰ “āĻ…-āύāϤুāύ āϏৃāώ্āϟি” āĻšāϤে āĻĒাāϰে āύা। āϝাāĻ•ে āĻŽুāĻ•্āϤিāĻĻাāύ āĻ•āϰা āĻšā§ŸেāĻ›ে, āϤাāĻ•ে āφāĻŦাāϰ “āĻ…-āĻ•্āϰ⧟িāϤ” āĻ•āϰা āϝা⧟ āύা। āĻ…āύāύ্āϤ āϜীāĻŦāύ āϏাāĻŽā§ŸিāĻ• āĻšāϤে āĻĒাāϰে āύা। āψāĻļ্āĻŦāϰ āϤাঁāϰ āĻŦাāĻ•্āϝ āĻ­াāĻ™āϤে āĻĒাāϰেāύ āύা। āĻļাāϏ্āϤ্āϰ āĻŦāϞে, āψāĻļ্āĻŦāϰ āĻŽিāĻĨ্āϝা āĻŦāϞেāύ āύা (āϤীāϤ ā§§:⧍)।

āĻāχ āĻŦিāĻļ্āĻŦাāϏেāϰ āĻŦিāϰুāĻĻ্āϧে āĻĻুāϟি āϏাāϧাāϰāĻŖ āφāĻĒāϤ্āϤি āϰ⧟েāĻ›ে āϝে, āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύ āĻĒāϰিāϤ্āϰাāĻŖ āĻšাāϰাāϤে āĻĒাāϰে āύা। āϏেāĻ—ুāϞো āĻšāϞো:
ā§§) āϝাāϰা āύিāϜেāĻĻেāϰ āĻ–্āϰিāϏ্āϟাāύ āĻŦāϞে āĻĻাāĻŦি āĻ•āϰে āĻ•িāύ্āϤু āĻĒাāĻĒāĻĒূāϰ্āĻŖ āĻ“ āĻ…āύুāϤাāĻĒāĻšীāύ āϜীāĻŦāύāϝাāĻĒāύ āĻ•āϰে—āϤাāĻĻেāϰ āĻ•ী āĻšāĻŦে?
⧍) āϝাāϰা āĻŦিāĻļ্āĻŦাāϏ āϤ্āϝাāĻ— āĻ•āϰে āĻāĻŦং āĻ–্āϰিāϏ্āϟāĻ•ে āĻ…āϏ্āĻŦীāĻ•াāϰ āĻ•āϰে—āϤাāĻĻেāϰ āĻ•ী āĻšāĻŦে?

āĻāχ āφāĻĒāϤ্āϤিāĻ—ুāϞোāϰ āϏāĻŽāϏ্āϝাāϟি āĻšāϞো āĻāχ āϧাāϰāĻŖা āϝে, āϝাāϰা āύিāϜেāĻĻেāϰ “āĻ–্āϰিāϏ্āϟাāύ” āĻŦāϞে, āϤাāϰা āϏāĻŦাāχ āϏāϤ্āϝিāχ āύāϤুāύ āϜāύ্āĻŽ āĻĒে⧟েāĻ›ে। āĻŦাāχāĻŦেāϞ āϘোāώāĻŖা āĻ•āϰে āϝে, āĻāĻ•āϜāύ āϏāϤ্āϝিāĻ•াāϰেāϰ āĻ–্āϰিāϏ্āϟাāύ āύিāϰāύ্āϤāϰ, āĻ…āύুāϤাāĻĒāĻšীāύ āĻĒাāĻĒেāϰ āĻŽāϧ্āϝে āĻŦাāϏ āĻ•āϰāĻŦে āύা (ā§§ āϝোāĻšāύ ā§Š:ā§Ŧ)। āĻŦাāχāĻŦেāϞ āφāϰāĻ“ āĻŦāϞে, āϝাāϰা āĻŦিāĻļ্āĻŦাāϏ āϤ্āϝাāĻ— āĻ•āϰে, āϤাāϰা āĻĒ্āϰāĻŽাāĻŖ āĻ•āϰে āϝে āϤাāϰা āĻ•āĻ–āύোāχ āϏāϤ্āϝিāĻ•াāϰেāϰ āĻ–্āϰিāϏ্āϟাāύ āĻ›িāϞ āύা (ā§§ āϝোāĻšāύ ⧍:⧧⧝)। āϏে āĻšā§ŸāϤো āϧāϰ্āĻŽী⧟ āĻ›িāϞ, āϏে āĻšā§ŸāϤো āĻ­াāϞো āĻ…āĻ­িāύ⧟ āĻ•āϰেāĻ›িāϞ, āĻ•িāύ্āϤু āϏে āĻ•āĻ–āύোāχ āψāĻļ্āĻŦāϰেāϰ āĻļāĻ•্āϤিāϤে āύāϤুāύ āϜāύ্āĻŽ āĻĒা⧟āύি। “āϤাāĻĻেāϰ āĻĢāϞেāϰ āĻĻ্āĻŦাāϰা āϤোāĻŽāϰা āϤাāĻĻেāϰ āϚিāύāĻŦে” (āĻŽāĻĨি ā§­:ā§§ā§Ŧ)। āψāĻļ্āĻŦāϰেāϰ āĻŽুāĻ•্āϤিāĻĒ্āϰাāĻĒ্āϤāϰা “āϤাঁāϰāχ, āϝিāύি āĻŽৃāϤāĻĻেāϰ āĻŽāϧ্āϝ āĻĨেāĻ•ে āωāϤ্āĻĨিāϤ āĻšā§ŸেāĻ›েāύ, āϝাāϤে āφāĻŽāϰা āψāĻļ্āĻŦāϰেāϰ āϜāύ্āϝ āĻĢāϞ āĻŦāĻšāύ āĻ•āϰি” (āϰোāĻŽী⧟ ā§­:ā§Ē)।

āψāĻļ্āĻŦāϰেāϰ āĻ•োāύো āϏāύ্āϤাāύāĻ•ে āĻĒিāϤাāϰ āĻ­াāϞোāĻŦাāϏা āĻĨেāĻ•ে āĻ•িāĻ›ুāχ āφāϞাāĻĻা āĻ•āϰāϤে āĻĒাāϰে āύা (āϰোāĻŽী⧟ ā§Ž:ā§Šā§Ž–ā§Šā§¯)। āĻ•োāύো āĻ•িāĻ›ুāχ āĻāĻ•āϜāύ āĻ–্āϰিāϏ্āϟাāύāĻ•ে āψāĻļ্āĻŦāϰেāϰ āĻšাāϤ āĻĨেāĻ•ে āĻ›িāύি⧟ে āύিāϤে āĻĒাāϰে āύা (āϝোāĻšāύ ā§§ā§Ļ:ā§¨ā§Ž–⧍⧝)। āψāĻļ্āĻŦāϰ āĻ…āύāύ্āϤ āϜীāĻŦāύেāϰ āύিāĻļ্āϚ⧟āϤা āĻĻেāύ āĻāĻŦং āϤিāύি āϝে āĻĒāϰিāϤ্āϰাāĻŖ āĻĻি⧟েāĻ›েāύ, āϤা āύিāϜেāχ āϰāĻ•্āώা āĻ•āϰেāύ। āωāϤ্āϤāĻŽ āϰাāĻ–াāϞ āĻšাāϰাāύো āĻ­ে⧜াāĻ•ে āĻ–ুঁāϜে āĻŦেāϰ āĻ•āϰেāύ, āĻāĻŦং “āϝāĻ–āύ āϤিāύি āϤা āĻ–ুঁāϜে āĻĒাāύ, āϤāĻ–āύ āφāύāύ্āĻĻেāϰ āϏāĻ™্āĻ—ে āĻ•াঁāϧে āϤুāϞে āύি⧟ে āĻŦা⧜ি āĻĢেāϰেāύ” (āϞূāĻ• ā§§ā§Ģ:ā§Ģ–ā§Ŧ)। āĻŽেāώāĻļাāĻŦāĻ•āĻ•ে āĻĒাāĻ“ā§Ÿা āϝা⧟, āĻāĻŦং āϰাāĻ–াāϞ āφāύāύ্āĻĻেāϰ āϏāĻ™্āĻ—ে āĻĻা⧟িāϤ্āĻŦ āĻŦāĻšāύ āĻ•āϰেāύ; āφāĻŽাāĻĻেāϰ āĻĒ্āϰāĻ­ু āĻšাāϰাāύো āϜāύāĻ•ে āύিāϰাāĻĒāĻĻে āϘāϰে āĻĢিāϰি⧟ে āφāύাāϰ āϏāĻŽ্āĻĒূāϰ্āĻŖ āĻĻা⧟āĻ­াāϰ āύেāύ।

āϝূāĻĻা ā§§:⧍ā§Ē–⧍ā§Ģ āφāϰāĻ“ āϜোāϰ āĻĻি⧟ে āφāĻŽাāĻĻেāϰ āωāĻĻ্āϧাāϰāĻ•āϰ্āϤাāϰ āĻŽāĻ™্āĻ—āϞ āĻ“ āĻŦিāĻļ্āĻŦāϏ্āϤāϤা āĻĒ্āϰāĻ•াāĻļ āĻ•āϰে:
“āϝিāύি āϤোāĻŽাāĻĻেāϰ āĻĒāϤāύ āĻĨেāĻ•ে āϰāĻ•্āώা āĻ•āϰāϤে āĻāĻŦং āϤাঁāϰ āĻŽāĻšিāĻŽাāĻŽā§Ÿ āωāĻĒāϏ্āĻĨিāϤিāϤে āύিāϰ্āĻĻোāώ āĻ“ āĻŽāĻšাāύ āφāύāύ্āĻĻেāϰ āϏāĻ™্āĻ—ে āωāĻĒāϏ্āĻĨিāϤ āĻ•āϰāϤে āϏāĻ•্āώāĻŽ—āĻāĻ•āĻŽাāϤ্āϰ āψāĻļ্āĻŦāϰ āφāĻŽাāĻĻেāϰ āωāĻĻ্āϧাāϰāĻ•āϰ্āϤাāϰ āĻšোāĻ• āĻŽāĻšিāĻŽা, āĻŽāĻšāϤ্āϤ্āĻŦ, āĻ•্āώāĻŽāϤা āĻ“ āĻ•āϰ্āϤৃāϤ্āĻŦ, āϝীāĻļু āĻ–্āϰিāϏ্āϟ āφāĻŽাāĻĻেāϰ āĻĒ্āϰāĻ­ুāϰ āĻŽাāϧ্āϝāĻŽে, āϏāĻ•āϞ āϝুāĻ—েāϰ āφāĻ—ে, āĻāĻ–āύ āĻāĻŦং āϚিāϰāĻ•াāϞ! āφāĻŽেāύ।”

Interference in Light vs Quantum States

đŸ”Ŧ The Double-Slit Experiment: Where It All Begins One of the most famous demonstrations of interference is the double-slit experiment. When...