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When reaching a boundary between two media, an incident ray is partially reflected and partially refracted....

When reaching a boundary between two media, an incident ray is partially reflected and partially refracted. The ray is travelling from media 1 to media 2. The indexes of refraction for the two media are n1 and n2, respectively. At what angle of incidence is the reflected ray perpendicular to the refracted ray? Express your answer in terms of the variables n1 and n2.

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