Answer:
In the given figure, £0 is the
incident ray, OO' is the refracted ray and O'H is the emergent ray
The extent of bending of the ray of
light at the opposite parallel faces AB (air-glass interface)and CD (glass-air
interface) of the rectangular glass slab is equal and opposite. This is why the
ray emerges parallel to the incident ray on a rectangular glass slab. However,
the light ray is shifted sideward slightly. When glass slab in immersed in any
medium the interface AB(medium-glass) and CD glass medium are equal and opposite
so, the emergent ray will always be parallel to the incident ray.
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