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Grade upto college level Engineering Entrance Exams

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.

Profile image of aditya kashyap
12 Years agoGrade upto college level
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2 Answers

Profile image of Saurabh Koranglekar
6 Years ago
Dear student

Under minimum deviation conditionr1​=r2​. Since the prism is equilateral (symmetric) and given the refracting angles are equal, QR will be horizontal.

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Profile image of Vikas TU
6 Years ago
For minimum deviation, incident angle is equal to emerging angle. Therefore, QR is horizontal......................

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