# 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 the Figure10.3

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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 the Figure10.3. 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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(a) A rectangular glass slab