Question

why are incident ray and amergent rays parallel in a glass slab

Answer 1

Explanation:

Emergent ray is parallel to the incident ray, after the refraction of Incident ray through a glass slab because the angle of incidence is equal to the angle of emergence and they are also the alternate interior angles.

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Answer 2

Answer:

becoz angle of incidence is equal to the angle of emergence and also they are alternate interior angle