Question

The angle between an incident ray and a reflected ray is 120⁰. What is the value of the angle of incidence and the angle of reflection? What is a valid reason?

Answer 1

In a plane.180°

Here given is 120°

So 180° - 120° = 60°

Incident ray = 30°

Reflected ray = 30°

Angle of incidence is always equals to angle of reflection.

Answer 2

Answer:

$\large\boxed{\sf{\angle i = \angle r = {60}^{\circ}}}$

Step-by-step explanation:

Given that,

The angle between an incident and reflected ray is 120°.

Now, to find the angle of incidence and angle of reflection.

We know that,

Normal divides the plane into two equal parts.

Those parts have angle of incidence and angle of reflection.

Also, we know that,

Normal divides the angle between incident and reflected rays in two equal parts.

So, from the given situation, we have,

Angle of Incidence = Angle of reflection = 120/2

Hence, angle of Incidence and Angle of reflection both are 60° each.