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A beam of light is incident through the holes on side A and emerges out of the holes on the other side of the box as shown in figure. Which of the following could be inside the box?

(a) Concave lens
(b) Rectangular slab
(c) prism
(d) Convex lens

Answers (1)

Answer: D

The incident rays are parallel and emergent rays are diverging. Concave lens is diverging in nature but the answer is convex lens as you can see the ray 10 which is at the top comes last after emerging out of the box, it means it converges first then diverge as shown in figure below.

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