A plane mirror makes an angle of ${30}^{\circ }$ with horizontal. If a vertical ray strikes the mirror, find the angle between mirror and reflected ray

The correct option is C ${60}^{\circ }$
The angle between mirror and normal is ${90}^{\circ }$.

Reflected ray (RR) makes an angle of ${30}^{\circ }$ with the normal.

Therefore the required angle between mirror and reflected ray will be $\theta ={90}^{\circ }-{30}^{\circ }={60}^{\circ }$.