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Day 274/365 of sharing my teaching practices. In Class 12 Physics, while deriving the Lens Maker’s Formula, we learn that a lens has two curved surfaces. That means the light doesn’t just bend once—it bends twice: 1️⃣ First when entering the lens medium (air → water in this demo). 2️⃣ Again when leaving the lens medium (water → air). 💡 In my demo, I used a cylindrical water-filled tumbler as a convex lens and passed two parallel green laser beams through it. You can clearly see: • At the first