Question

A ray of light, falling normally on a plane mirror, gets reflected in such a way that it-

becomes parallel to the mirror surface after reflection

now makes an angle of 30degree with the plane mirror

now makes an angle of 60degree with the plane mirror

just retraces the path

​

Answer 1

Explanation:

Now makes an angle of 60 degree with the plane mirror

Answer 2

Explanation:

Case (a):

If a ray of light is incident normal to the surface of the plane mirror, then the angle of incidence is 0

0

, as the normal passes perpendicularly to the mirror.

Case (b):

The Second Law of Reflection states that the angle of incidence is always equal to the angle of reflection. Therefore, the angle of reflection is same as the angle of incidence, that is, 0

0

. So, the reflected ray will retrace the path of the incident ray