Question

The angle between the mirror and reflected ray is ${23}^{\circ }$ . What is the angle of incidence of the incident ray ?

Answer 1

$\angle r+{23}^{\circ }={90}^{\circ }$
$\Rightarrow \angle r={67}^{\circ }$
Using law of reflection , we have :
$\angle i=\angle r={67}^{\circ }$