Question

Show that 'incident ray' and 'emergent ray’ through opposite faces of a rectangular glass slab,
are mutually parallel.​

Answer 1

Explanation:

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Why is emergent ray parallel to the incident ray for refraction through a rectangular glass slab?

This is because in the case of the glass slab the surfaces (on which light is incident and emerging) are opposite and parallel to each other. Whereas, in the case of a glass prism the surfaces are inclined to each other at some angle.