Question

Or
(i) In refraction of light through a rectangular, glass slab, the emergent ray is parallel to the
direction of the incident ray. Why?
(ii) What happens when a light ray is incident normally on one of the faces of a rectangular glass
slab?
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Answer 1

Answer:

1) the light first bends towards the normal and then away from the normal when enters from lighter to denser and denser to lighter medium respectively and so it the same medium so the light emergent ray is parallel to incident ray

the same reaction takes place when light ray is incident on one of the faces of rectangular glass slab

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