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

`40^(\circ)`

Step-by-step 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)`.