Question

The geometric relation between incident ray and emergent ray

Answer 1

Answer:

Since the surfaces are parallel the ray inside the glass falls at the other surface at angle r and therefore the ray emerges at angle i that is the angle of incidence. Therefore the incident ray is parallel to the emergent ray.

Answer 2

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The angle of incidence = the angle of emergence because the incident and emergent rays are parallel, making the normals parallel, and with the refracted ray acting as a transversal, they become alternate exterior angles and hence,equal