Question

A light beam is being reflected by using two mirrors,as in a periscope used in submarines.if one of the mirrors rotates by an angle $\theta$, the reflected light will deviate from its original path by the angle

• A. $2\theta$
• B. $3\theta$
• C. $\theta$
• D. $4\theta$

Answer 1

The correct option is A $2\theta$

When a mirror is rotated by an angle a. The reflected ray deviate from its original path by angle $2\theta$. Since the given angle is $\theta$ and the deviation will be a multiple of $2$. Thus, $2\theta$ will be the answer.