Question

A ray of light makes an incident angle half as that of the angle that it makes with the surface of reflection. Find the angle of reflection for this ray.

• A. ${90}^0$
• B. $0^0$
• C. ${30}^0$
• D. ${60}^0$

Answer 1

The correct option is C ${30}^0$

let us say that the angle of incidence is $x$.

According to the question angle between incident ray and the surface is $2x$.

The sum of both these angles will be ${90}^0$.

So $x+2x={90}^0$

$3x={90}^0$

$x={30}^0$