Question

An incident light ray hits a plane surface at 20 degrees (hint: remember where the angle is measured from). What is the angle between the incident and reflected rays? So is it 20 degrees or 40 degrees

Answer 1

Answer:

$40^{\circ}$

Explanation:

The incident angle is $20^{\circ}$ so the reflected ray will also be $20^{\circ}$.

The normal divides the angle between the incident and reflected ray. So, the angle between them would be

$\text{Incident angle}+\text{Reflected angle}=20+20=40^{\circ}$

So, the angle between the incident and reflected rays is $40^{\circ}$.