Physicshard · Past Paper
A ray of light is incident at 60 degrees on one face of an equilateral prism. If it suffers minimum deviation, the angle of deviation is:
A30 degrees
B60 degrees
C45 degrees
D90 degrees
✓ Correct Answer: B — 60 degrees
At minimum deviation, i = (A+Dm)/2. 60 = (60+Dm)/2 => 120 = 60+Dm => Dm = 60.
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