Question

In an experiment to study refraction through a glass slab, it is observed that a ray of light undergoing refraction emerges parallel to the direction of incident ray. Why does it happen so?​

Answer 1

Answer:

In case of refraction through a rectangular glass slab, the incident and emergent rays are parallel to each other because the angle of emergence ∠e is equal to the angle of incidence ∠i, i.e. ∠e = ∠i.

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Answer 2

Answer:

This is because the angle of incident is equal to the angle of emergence

Explanation:

When light enters the slab, it bends toward the normal and when it emerges it goes away from normal since it going back into the same medium hence angle of incident is equal to the angle of refraction and we see an overall lateral displacement