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What it is
The change of direction of a ray of light, sound, heat, etc. in passing indirectly from one object into another in which its wave velocity is different.
What it's used for
To help see things near and far away.
Science behind it
Snell's law
(nA Sinθ A = nB Sinθ B) predicts how the ray will change direction as it passes from one medium into another, or as it is reflected from the interface between two media.
Refraction
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