Question

If the ray of light incident on a plane mirror makes an angle of ${25}^{\circ }$ with the mirror as shown in the figure.

What will be the angle of reflection?

• A. ${65}^{\circ }$
• B. ${50}^{\circ }$
• C. ${45}^{\circ }$
• D. ${30}^{\circ }$

Answer 1

The correct option is A ${65}^{\circ }$


Given, $\angle AO{M}_1={25}^{\circ }$
We know that $\angle i=\angle r$
Also, $\angle M_{1}ON=\angle M_{1}OA+\angle AON$
${90}^{\circ }={25}^{\circ }+\angle i$
$\Rightarrow \angle i={90}^{\circ }-{25}^{\circ }={65}^{\circ }$
$\therefore \angle i=\angle r={65}^{\circ }$