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 90°
C. incident angle equals 90°
D. incident angle is equal to the angle of emergence

Correct Answer:

Option D – incident angle is equal to the angle of emergence

Explanation

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