Question

If plane mirror is rotated through an angle ${40}^{\circ }$ then reflected ray is rotated through

• A. ${20}^{\circ }$
• B. ${40}^{\circ }$
• C. ${60}^{\circ }$
• D. ${80}^{\circ }$

Answer 1

The correct option is D ${80}^{\circ }$

When a plane mirror is rotated through an angle $\theta$, the angle turned by the reflected ray will be $2\theta$.

According to the given data, the mirror is rotated through an angle ${40}^{\circ }$. So the reflected ray will turn through an angle of ${80}^{\circ }$.