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A ray of light incident on the face AB o...

A ray of light incident on the face AB of an isosceles triangular prism makes an angle of incidence i and deviates by an angle `beta` on shown in figure. Show that in the position of minimum deviation `anglebeta=anglealpha`. Also find out the condition when the refracted ray QR suffers total internal reflection.

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For minimum deviation, the refracted ray inside the prism is parallel to the base of the prism.
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