question_answer

Four identical mirrors are made to stand vertically to form a square arrangement as shown in a top view. A ray starts from the midpoint M of mirror AD and after two reflections reaches corner D. Then, angle \[\theta \] must be

A) \[{{\tan }^{-1}}\left( 0.75 \right)\]                      

B) \[{{\cot }^{-1}}\left( 0.75 \right)\]

C) \[{{\sin }^{-1}}\left( 0.75 \right)\]                      

D) \[{{\cos }^{-1}}\left( 0.75 \right)\]