question_answer

Let the incident ray be fixed. Now, if a plane mirror is rotated through an angle of \[{{20}^{o}}\] about an axis lying in its plane, then the reflected ray turns through an angle

A)  \[{{60}^{o}}\]                   

B)  \[{{40}^{o}}\]

C)  \[{{10}^{o}}\]                                   

D)  \[{{30}^{o}}\]