Question

why the incident ray-----​

Answer 1

Answer:

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.

Explanation:

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Answer 2

Answer:

Because after refraction the angle of incidence is equal to angle of emergent ray and their are alternative interior angle.

so they are parallel to each other