1.

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.  \[{{30}^{o}}\]
Answer» C.  \[{{10}^{o}}\]                                   


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