1.

The incident ray and the reflected ray from a mirror are mutually perpendicular to each other. The angle of incidence is

A.  \[{{90}^{o}}\]                                   
B.  \[{{45}^{o}}\] 
C.  \[{{22.5}^{o}}\]                               
D.  zero
Answer» C.  \[{{22.5}^{o}}\]                               


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