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Question

A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure:
Figure
The box contains:
(a) a glass prism
(b) a concave lens
(c) a convex lens
(d) a parallel-sided glass slab

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Solution

(b) a concave lens

This is because the emergent rays of light are diverging.

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