Question

what is the lateral displacement of when a ray of light falls normally on a glass slab ?​

Answer 1

Answer:

When light falls perpendicularly or normally on the surface of a glass slab, it goes straight. There is no bending of ray of light on entering the glass slab or coming out of it. In this case angle of incidence and angle of refraction is zero.

Explanation:

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Answer 2

Answer: The lateral shift by a glass slab is x = t sin(i-r) / cos r

Explanation:

Here t is thickness of glass slab, i is incident angle and r is refracted angle.