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Beam A is the right choice!

When a beam of light enters a substance with a higher index of refraction, or a higher density the beam of light bends towards the normal. Since the index of refraction of water is 1.33 and the index of refraction for lucite is 1.50 the beam of light bends toward the normal


To see the indexes of refraction for other substances click here

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You can use indexes of refraction to find out how fast a beam of light is travelling in an object using the formula

n₁v₁=n₂v₂

To see more formulas using indexes of refraction click here

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