Refraction at Spherical Surface – Full Derivation | Ch 9 Optics |

Описание: In this video, I have explained Refraction at Spherical Surface, one of the most important derivations from Chapter 9 – Ray Optics for AHSEC Class 12 Physics 📐✨

This derivation is taught step by step on the board, exactly in the way required for Assam Higher Secondary Education Council (AHSEC) board exams.

🔍 What you’ll learn in this video:
✅ Clear concept of refraction at spherical surface
✅ Proper ray diagram explanation
✅ Step-by-step mathematical derivation
✅ Final formula with sign convention
✅ How to write answers in board-exam format

📌 This derivation is very important for long-answer questions and helps you score maximum marks in Optics.
If you understand this derivation well, numericals and theory questions become very easy 💯

🎯 Useful for:
• AHSEC Class 12 Physics students
• Board exam preparation
• Chapter 9 Optics revision
• Derivation-based questions

👉 Watch till the end for complete clarity
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