Class 12th | Physics | Ray Optics | Convex Refracting Surface | Video-7 | NEET & JEE | By Khan Sir

Описание: 📘 Class 12 Physics | Ray Optics – Convex Refracting Surface | Video 7 | CBSE | JEE | NEET

Welcome to the Ray Optics Series for Class 12 Physics!
This is Video 7, where we explore an important concept in refraction — the Convex Refracting Surface. Understanding refraction at curved surfaces is essential before learning lenses, lens formula, and optical instruments. This topic is highly relevant for CBSE Board Exams, as well as competitive exams like JEE Mains, JEE Advanced, and NEET.

In this lecture, you’ll learn how light behaves when passing from one medium to another through a convex spherical surface, how images are formed, and how to apply the refraction formula. With clear ray diagrams, mathematical derivations, and numerical problems, this video builds strong conceptual and problem-solving skills for advanced optics.

✨ What you’ll learn in this video:

✔️ Introduction to refraction at spherical surfaces
✔️ Geometry and structure of a convex refracting surface
✔️ Derivation of the refraction formula:
  (n₂ / v) – (n₁ / u) = (n₂ – n₁) / R
✔️ Sign convention for spherical refracting surfaces (CBSE/JEE format)
✔️ Real and virtual image formation at convex surfaces
✔️ Step-by-step ray diagrams for convex refraction
✔️ Numericals based on image position and refractive index
✔️ Conceptual differences between convex mirror and convex refracting surface
✔️ Solved examples from NCERT, JEE Mains, and NEET
✔️ Practice questions and quick tricks for solving refraction problems faster

📌 Who should watch this video?

🔹 Class 12 CBSE & State Board students studying Ray Optics
🔹 JEE aspirants who want a strong foundation in curved-surface refraction
🔹 NEET Physics students focusing on optics fundamentals
🔹 Students preparing for exams that include refraction formula derivations
🔹 Learners who want clear visual explanations of convex refracting surfaces

🌟 Why this video is important:

✅ Builds the foundation for Lens Formula and Lens Maker’s Formula
✅ Strengthens understanding of refraction at curved interfaces
✅ Covers derivations + diagrams + numericals together
✅ Helps score full marks in optics derivations in Boards
✅ Highly useful for solving conceptual and numerical problems in JEE & NEET

📚 Ray Optics Series Progress:

1️⃣ Spherical Mirrors – Basics & Image Formation
2️⃣ Mirror Formula for Real Image
3️⃣ Mirror Formula for Virtual Image
4️⃣ Numericals on Concave Mirror
5️⃣ Real & Apparent Depth
6️⃣ Total Internal Reflection
7️⃣ Convex Refracting Surface (This Video)
8️⃣ Lens Formula & Lens Maker’s Formula (Next Video)
9️⃣ Prism, Dispersion & Total Internal Reflection
🔟 Optical Instruments – Human Eye, Microscope, Telescope

💡 Tip for Students:
Always apply the sign convention first before writing the formula. Most mistakes in refracting-surface numericals come from incorrect signs. Practice 8–10 problems regularly to master this concept.

🔔 Stay Connected:

✔️ Subscribe to Khan Quantum Academy for the complete Class 12 Physics Series
✔️ Like & Share this video with friends preparing for Boards, JEE & NEET
✔️ Comment your doubts below — we’ll answer them in upcoming videos

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