Beams of light are incident through the holes- $A$ and $B$ and emerge out of the box through the holes $C$ and $D$ respectively as shown in the figure. Which of the following could be inside the box?

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A rectangular glass slab

A convex lens

A concave lens

A prism

answer is A.

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Detailed Solution

A rectangular glass slab could be inside the box.
According to the diagram above, the emergent rays are parallel to the incident light. A rectangular glass slab might be contained inside the box since lateral displacement occurs in the parallel rays. Consequently, a rectangular glass slab is a solution.

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