Question

A ray of light is incident on a convex mirror at an angle of incidence of $30°$. What is the angle of reflection?

• A. $15°$
• B. $30°$
• C. $60°$
• D. none of these

Answer 1

The correct option is B

$30°$

Explanation

The Law of reflection states that-

1. The angle of reflection is equal to the angle of incidence when light rays fall on a smooth surface,
2. All three rays, incident, reflected, and normal to the surface, are in the same plane.

The angle measured from the reflected ray to the normal surface is the angle of reflection of a ray.

So, according to the law,

$\angle i=\angle r$

$$\begin{gathered} \angle i=30° \\ \Rightarrow \angle r=30° \end{gathered}$$

Hence, the correct answer is B.