question_answer

Two plane mirrors are placed perpendicular to each other. A ray strikes one mirror and after reflection from the second mirror will be

A)  perpendicular to the original ray

B)  parallel to the original ray

C)  at\[45{}^\circ \]to the original ray

D)  can be at any angle to the original ray

Correct Answer: B

Solution :

 Ray after reflections from two perpendicular mirrors are always parallel to incident ray irrespective of angle of incidence.