📘 Lens Maker’s Formula – Important Derivation | Class 12 Physics by Deepanshu Sir 🎯

Описание: 📘 Lens Maker’s Formula – Important Derivation | Class 12 Physics by Deepanshu Sir 🎯
Chapter: Ray Optics & Optical Instruments
Topic: Lens Maker’s Formula (Derivation & Application) – CBSE / NEET / JEE Preparation

📖 What This Video Covers

In this video, Deepanshu Sir explains the important derivation of the Lens Maker’s Formula step-by-step using refraction at two spherical surfaces of a thin lens. This derivation is essential for understanding how a lens’s focal length depends on its shape and material.

🔹 Refraction of light at two spherical surfaces of a thin lens
🔹 Combining the equations for both surfaces to derive the final formula
🔹 How the focal length of a lens relates to its refractive index and radii of curvature
🔹 Applying Cartesian sign conventions correctly
🔹 Special case: object at infinity (defining the focal point)

📌 Topics Explained in This Class

✔️ Refraction through the first surface of a lens
✔️ Refraction through the second surface
✔️ How to add refracting equations

📚 Useful for

✔️ CBSE Class 12 Board Exams
✔️ NEET Physics
✔️ JEE Main & Advanced
✔️ Quick revision & notes

📍 Exam Tips

✔️ Always draw neat ray diagrams
✔️ Write clear sign conventions before derivation
✔️ Practice numericals using the formula
✔️ Understand how lens shape affects focal length

👍 Stay Connected

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📌 Drop your questions in comments – Sir may answer them!

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