A ray of light enters the long side of a 45-90-45prism and, Ask an Expert

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A ray of light enters the long side of a 45-90-45prism and undergoes two total internal reflections, as indicated in the figure . The result is a reversal in the ray's direction of propagation.

Find the minimum value of the prism's index of refraction, , for these internal reflections to be total.

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