Question

A light ray is incident on a plane mirror at an angle of $60°$. Calculate the angle of reflection.

Answer 1

Step 1: Given data and drawing the diagram of the situation

Given data:

The angle of incidence $"\angle i"$ = $60°$

The angle of reflection $"\angle r"$=?

The diagrammatic representation of the given case is,

Step 2: Formula used

According to the first law of reflection,

The angle of incidence is always equal to the angle of reflection. i.e $\angle i=\angle r......\left(a\right)$.

Step 3: Calculating the angle of reflection

On, putting all the given values in equation (a), we get

$"\angle r"=60°$.

Then, the angle of reflection $"\angle r"=60°$.

Hence, if a light ray is an incident on a plane mirror at an angle of $60°$, it will be reflected with the angle of reflection of $60°$.