Question

A ray of light falls on one of the lateral surface of an equilateral glass prism placed on thehorizontal surface of a table.For minimum deviation of ray, which ofthe following is true? [ ]a) PQ is horizontalb) QR is horizontalc) RS is horizontald) either PQ or RS is horizontal

Answer 1

Answer:

Option (b) QR is horizontal

Explanation:

In order to have a minimum deviation, the refracted ray inside the prism should be parallel to the base of the prism. Therefore QR should be parallel to the base of the prism. Since the base of the prism is horizontal, QR should be horizontal. Therefore, the correct option is option (b).

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Answer 2

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