Question

4.A ray of light is incident normally to the surface of a glass slab placed in air give angle

of incidence and angle of refraction in this case.​

Answer 1

Answer:

The ray of light which is incident normally on a plane glass slab passes undeviated. That is such a ray suffers no bending at the surface because here the angle of incidence is 0°. Thus if angle of incidence ∠i= 0°, then the angle of refraction ∠r = 0°. And the angle of deviation of the ray will also be 0°.