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A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure:
The box contains:(a) a glass prism (b) a concave lens(c) a convex lens (d) a parallel-sided glass slab"
(b) a concave lens
Explanation
The beam of light is diverging when it is coming out through the holes of the box, therefore, there should be a concave lens inside the box.
Diverging Lens or Concave Lens $-$ It is a lens that possesses at least one surface that curves inwards in the middle. In other words, it is thin across the middle and thick at the upper and lower edges, because of which the light that enters the lens, gets spread out, or diverges, which results in forming a smaller image. Due to this effect, it is also called a negative lens or a diverging lens.
The image formed by a concave lens is virtual & erect, which means it will appear to be farther away than it actually is, and therefore smaller than the object itself.
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