Index of Refraction

In optical equations, this shows up as “n”. Different materials usually have different indices of refraction. As a light ray goes from one material to another, the amount the light ray bends will be determined by how different the “n” of the first material is from the “n” of the second material. If you don’t want the light to bend as much, you’d look for materials that have similar or matching indices of refraction.

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