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An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it.

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An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation
(a) PQ is horizontal
(b) QR is horizontal
(c) RS is horizontal
(d) Any one will be horizontal

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(b) For minimum deviation, incident angle is equal to emerging angle. QR is horizontal
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