JEE Mains 2026 - 21/1/2026-S1 | Beam Expansion Using Convex Lenses | Complete Solution скачать в хорошем качестве

JEE Mains 2026 - 21/1/2026-S1 | Beam Expansion Using Convex Lenses | Complete Solution

Complete solution to Question 46 from JEE Mains 2026 (21st January 2026 - Shift 1) Physics Paper. 📌 Topic: Ray Optics and Optical Instruments | Beam Expander ❓ Question: A collimated beam of light of diameter 2 mm is propagating along the x-axis. The beam is required to be expanded in a collimated beam of diameter 14 mm using a system of two convex lenses. If the first lens has focal length 40 mm, then find the focal length of the second lens in mm. ✅ Solution Includes: Beam expander principle (Keplerian/Galilean) Magnification formula: M = d₂/d₁ Magnification in terms of focal lengths: M = f₂/f₁ Relationship: d₂/d₁ = f₂/f₁ Calculation: 14/2 = f₂/40 Step-by-step algebraic solution Focal length determination Correct answer with complete explanation 🎯 Perfect for: JEE Mains 2026 aspirants Ray Optics chapter revision Optical instruments problems Lens system applications 📚 Part of my complete JEE Mains 2026 solution series with detailed explanations! 🔔 Subscribe for daily JEE Mains physics solutions 👍 Like if this helped you understand beam expanders 💬 Comment your approach to this problem #JEEMains2026 #RayOptics #BeamExpander