# 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 given

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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 given 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 answer is(a) A rectangular glass slab

• When incident rays fall perpendicularly on the point of incidence.
• A rectangular glass slab would refract and then re-refract it.

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