Physicshard · Past Paper
The refractive index of a prism is 1.5 and the angle of prism is 60. The angle of minimum deviation is:
A37.2 degrees
B48.6 degrees
C30 degrees
D60 degrees
✓ Correct Answer: A — 37.2 degrees
Using n = sin((A+Dm)/2) / sin(A/2). 1.5 = sin((60+Dm)/2) / 0.5. sin((60+Dm)/2) = 0.75. (60+Dm)/2 ≈ 48.6. Dm ≈ 37.2.
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