Lens Formula, Magnification & Power of Lens | Class 10 Light Chapter | Part 6 (Final)
Lens Formula, Magnification, and Power of Lens – Class 10 Science Chapter 9 (Light: Reflection and Refraction) | Final Part 6 Welcome to the FINAL part of the Light chapter! In this video, we complete the chapter with three extremely important concepts for Class 10 exams: • Lens Formula • Magnification for Lenses • Power of a Lens (Dioptres) This part is the MOST scoring for Class 10 Science Board Exams, because numerical questions are directly asked from: ✔ Lens formula (1/v – 1/u = 1/f) ✔ Magnification formula (m = h’/h = v/u) ✔ Power of lens (P = 1/f in metres) ------------------------------------- 📘 What You Will Learn Today: ------------------------------------- ✔ New Cartesian Sign Convention for Lenses ✔ Lens Formula (Concave + Convex) ✔ Magnification Formula and Sign Meaning ✔ Power of a Lens (Convex = +P, Concave = –P) ✔ How to convert focal length cm → m ✔ How to calculate +D or –D power for spectacles ✔ Step-by-step NCERT-style numerical solutions ------------------------------------- 💡 Complete Numerical Practice Covered: ------------------------------------- • Example 1: Finding image distance using lens formula • Example 2: Virtual image by convex lens (special case) • Example 3: Magnification calculation from heights • Example 4: Power of convex lens (positive power) • Example 5: Power of concave lens (negative power) ------------------------------------- 🎯 Who Should Watch? ------------------------------------- • Class 10 CBSE Board Students • NCERT Chapter 9 Full Revision • Students preparing for optics fundamentals • JEE/NEET Foundation Beginners • Anyone revising Light – Reflection & Refraction ------------------------------------- 📌 Suggested Timestamps (Add after editing) ------------------------------------- 00:00 – Introduction (Final Part) 02:10 – New Cartesian Sign Convention 04:40 – Lens Formula (Explanation + Derivation Feel) 08:30 – Magnification Formula 11:20 – Power of Lens (Dioptre System) 14:45 – Solved Numerical Examples 22:00 – Summary + Board Tips 24:30 – Final Chapter Conclusion ------------------------------------- ❤️ Powered by Brain Booster Academy (EgPadhai) ------------------------------------- This video is part of our free education initiative to make quality learning accessible to every student. If you got value from this lesson: ✓ Like the video ✓ Share it with classmates ✓ Subscribe for full Physics + Chemistry + Maths playlists All the very best for your Class 10 Board Exams! — Ritesh Sir, Brain Booster Academy #LensFormula #Magnification #PowerOfLens #Class10Science #LensFormula #Class10Science #LightReflection#LightChapter #CBSE2025 #EgPadhai #BrainBoosterAcademy
