11- Lens Formula Class 12 Physics | Ray Optics | JEE NEET CBSE | Satish Goyal Physics Classes

Welcome to Satish Goyal Physics Classes.
In this detailed lecture, we explain the Lens Formula from Ray Optics, one of the most important and high-weightage topics in Class 12 Physics for CBSE Board, JEE Main, JEE Advanced, and NEET.
The lens formula gives the relationship between object distance (u), image distance (v), and focal length (f) of a lens. This formula works for both convex lenses and concave lenses when used with the New Cartesian Sign Convention.
📌 Lens Formula:
In this lecture, we start from basic concepts, explain ray diagrams, and then derive the lens formula step-by-step so that students can clearly understand its physical meaning and exam application.
🔍 What You Will Learn in This Lecture
• Types of lenses – convex lens and concave lens
• Image formation by convex and concave lenses
• New Cartesian sign convention in ray optics
• Derivation of lens formula
• Numerical problems based on lens formula
• Sign of focal length, object distance and image distance
• Real image vs virtual image
• Common mistakes in board and competitive exams
• Fast problem-solving techniques for JEE & NEET
🎯 Who Should Watch This Video
✔ Class 12 CBSE / ISC students
✔ JEE Main & JEE Advanced aspirants
✔ NEET aspirants
✔ Olympiad & foundation students
✔ Anyone preparing Ray Optics from basics to advanced
This lecture is part of our complete Ray Optics Physics Course, where we cover: Reflection of Light
Spherical Mirrors & Mirror Formula
Refraction of Light
Lenses & Lens Formula
Magnification
Lens Maker’s Formula
Optical Instruments
All lectures are taught with a concept-first approach, focusing on exam-oriented numericals, clarity of sign convention, and strong fundamentals.
🏫 About Satish Goyal Physics Classes
At Satish Goyal Physics Classes, we provide: ✔ Small batch teaching
✔ One-to-one attention
✔ Board + JEE + NEET integrated preparation
✔ Offline & Online Classes
📍 Address: M-49, Kalkaji, New Delhi
📞 Contact: 9711289192
🌐 Website: www.satishgoyalphysics.com
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