Question

A Ray of light makes an angle of 50 degree with the surface S1 of the glass slab. It's angle of incident will be

Answer 1

Its angle of incidence will be 40 degrees.

Answer 2

Answer:

The angle of incidence when the incident ray strikes the lass slab at 50° is 40°.

Explanation:

Step 1 : Understand the meaning of incident angle and other related angles.

When a light ray strikes a glass slab we normally have the following angles.

1) The incident angle

2) The reflection angle.

We have the normal ray that is perpendicular to the reflecting surface.

The angle of incidence — This is the angle that forms between the incident ray and the Normal at the point of incidence.

If the incident ray strikes the reflecting surface at w the incident angle will be given by :

= 90° - w

Step 2: Substitute the given values to get the angle of incidence.

In our case w = 50°

The angle of incidence = 90° - 50° = 40°

The incident angle is therefore 40°.