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Question

The principal section of glass prism is an isosceles ΔPQR with PQ = PR. The face PR is silvered. A ray is incident perpendicularly on face PQ, and after two reflections, it emerges from base QR, normal to it. Find the angle (in degree) of the prism.

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Solution


The angle at second reflection is
9A2+π22A=π
5A2=π2
A=π5=36o

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