Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in Figure. Which of the fo

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

A. A rectangular glass slab
B. A convex lens
C. A concave lens
D. A prism

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The emergent rays are parallel and displaced laterally. Therefore, a rectangular glass slab might be inside the box.

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