Question

what happens to the light ray, when it strikes the interface normally?​

Answer 1

Answer:

When light ray strikes a surface perpendicularly, all its parts enter the medium at the same time. So, all the parts of light will have a change in speed at the same time. So, there will be no bending but only change in speed of light ray.

Answer 2

Answer:

When it strikes the interface normally the light ray deviates