Question

Beam of light are incident through the holes A and B and emerge out of box through the holes C and D 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 ​

Answer 1

ANSWER-(a)A rectanguar glass slab

Explanation
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Since lateral displacement is taking place in the parallel rays, a rectangular glass slab could be inside the box. Lateral displacement is the distance by which the incident light has been displaced after bending through the glass slab.
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Answer 2

(A)$\large\bf\pink{A\:\: rectangular\:\:glass\:\:slab}$

★$\large\bf\red{Explanation✓}$

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