question_answer

A ray of light fails on a plane mirror. When the mirror is turned, about an axis which is at right angle to the plane of the mirror through \[{{20}^{o}}\] the angle between the incident ray and new reflected ray is \[{{45}^{o}}\]. The angle between the incident ray and original reflected ray was therefore:

A) \[{{65}^{o}}\] 

B) \[{{25}^{o}}\] or \[{{65}^{o}}\]       

C) \[{{25}^{o}}\]

D) \[{{45}^{o}}\]