A ray of light is incident on a 60º prism at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is

Question

Dr. Abubacker · Accepted Answer

[Solution from source] At minimum deviation the ray passes symmetrically, so r₁ = r₂ and r₁ + r₂ = A. Hence r₁ = A/2 = 60°/2 = 30°. Taking 60° confuses the refraction angle with the prism angle itself. Answer (2).

Q. A ray of light is incident on a 60º prism at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is

Explanation

Reviewed by Dr. Abubacker

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