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

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

G1 Physics · Accepted Answer

Step 1: At minimum deviation r₁ = r₂ = A/2. Step 2: Use the prism angle shown or given in the original source, A = 60°. Step 3: Hence r₁ = 30°. Final answer: (B) 30°.