Light Around Us: Denser and Rarer Medium
Four everyday puzzles · Speed of light in six media · Optical vs physical density
Explain the pencil, bubbles, lens and rainbow
Give causes and remedy for blurred vision
Read the speed of light table
Pick the denser and rarer medium in a pair
A pencil looks broken in water
Air bubbles shine like mirrors
A hand lens makes letters look big
Sunlight splits into seven colours
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