Describes the path light rays take when they pass through an interface between two media of different densities. It is a formal description of the way light bends when it passes through an interface between two materials with different densities. The law is derived from Snell's equation:
Θr = arcsin [ (sin (Θi) × ni ÷ nr]
The equation can be used to determine the path a light ray will take at a surface given knowledge of the densities of the two media and the angle if incidence.
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