A coin is sitting at the bottom of a glass, 26.7 cm deep below the surface of a clear but unknown liquid. You look at the coin from overhead and with your unparalleled skill at determining distances, you observe it to appear to be 11.3 cm below the surface. What is the index of refraction of the liquid?

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Dispersion of White Light

Snell’s law is a formula that gives a relation between the angle of incidence and angle of refraction and is given as: