Question

A plane mirror makes an angle of ${30}^o$ with the horizontal. If a vertical ray strikes the mirror. Find the angle between the mirror and the reflected ray?

Answer 1

From law of reflection,

$i=r$

To find $\alpha$,

$i+{60}^o={90}^o$

$i={30}^o=r$

So $\alpha =90-r={60}^o$