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: Option D
Explanation
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)