Question

A mirror is inclined at an angle $\theta$ with the horizontal and a ray of light is incident on it as shown. Find the angle made by the reflected ray with the horizontal.

• A. $\theta$
• B. $2\theta$
• C. $\theta /2$
• D. Zero

Answer 1

The correct option is D Zero


From figure,
$\angle i={90}^{\circ }-\theta$
$\Rightarrow \angle r={90}^{\circ }-\theta$
Therefore, the angle made by the reflected ray with mirror is,
$={90}^{\circ }-({90}^{\circ }-\theta )=\theta$
So, the ray is reflected horizontally. It means reflected ray make $0^{\circ }$ angle with horizontal.
Hence, option $\left(d\right)$ is the correct answer.