We use Snell's law to get the index of refraction of the second medium.
A light ray is incident on an flat interface between two media. The first medium has index n1 = 1.8 and the second medium has an unknown index. The incident angle of the ray is 22° from the normal and the refracted ray is 18° from the normal. What is n2, the index of refraction of the second medium?
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