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A ray incident on a glass prism undergoes minimum deviati...

A ray incident on a glass prism undergoes minimum deviation when the

A.

incident angle is equal to the angle of refraction

B.

refraction angle equals 90o

C.

incident angle equals 90o

D.

incident angle is equal to the angle of emergence

Correct answer is D

At minimum deviation, it is observed that light passes symmetrically through, the prism such that the angle of incidence (io) is angle to the angle of emergency (eo).(i/e Io = eo)