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Question 20241
JEE Physics · Hard

Ray Optics: Prism — Minimum Deviation MCQ

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Prism — Minimum DeviationHardQuestion 20241

Question

A prism of apex angle 60° has n = √3. Minimum deviation angle is:
  1. A
    30°
  2. B
    60°
    Correct
  3. C
    45°
  4. D
    90°

Correct answer

60°

Explanation

n = sin[(A+D_m)/2]/sin(A/2) = sin[(60+D_m)/2]/sin30°. √3 = sin[(60+D_m)/2]/0.5 → sin[(60+D_m)/2] = √3/2 = sin60° → (60+D_m)/2 = 60° → D_m = 60°.

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