Snell's law describes how light (or any wave) bends when it passes from one medium into another of different density. n₁ × sin(θ₁) = n₂ × sin(θ₂), where n is the refractive index and θ is the angle from the normal.
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Did You Know?
Diamonds have the highest refractive index of natural gems (2.42) and a critical angle of only 24.4°. Most of the light that enters a diamond undergoes total internal reflection multiple times, creating brilliant sparkle.
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