question_answer

A ray of light is incident at \[50{}^\circ \] on the middle of one of the two plane mirrors arranged at an angle of \[60{}^\circ \]between them. The ray then touches the second mirror, get reflected back to the first mirror, making an angle of incidence of

A) \[50{}^\circ \]

B) \[60{}^\circ \]   

C) \[70{}^\circ \] 

D) \[80{}^\circ \]

Correct Answer: C

Solution :

[c] See geometry of the figure.