Note that Snell's law not only applies to the case of the laser beam passing through air and gelatin, but also to other examples of how the incident object changes direction as it passes from a faster medium to a slower medium, and vice versa. The second material has an index of refraction n 2 and the speed of light in the material is v 2 (image credit Wikimedia Commons user Oleg Alexandrov). The first material has an index of refraction n 1 and the speed of light in the material is v 1. It passes through the interface and is refracted to angle θ 1 to the normal. An incident light beam approaches the interface between two materials at angle θ 1 to the normal. Definitions of the variables used in Snell's law.
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