STANDARD Physics Prisms MCQ Question with Solution

The refracting angle of a prism is A, and refractive index of the material of the prism is cot(A/2). The angle of minimum deviation is:

A

180° + 2A

B

180° − 3A

C

180° − 2A

D

90° − A

Correct Answer

Option C

Detailed Explanation

The angle of minimum deviation for a prism with refracting angle A and refractive index μ = cot(A/2) is given by δ = 180° − 2A.

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