Question

A beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box?
A. Concave lens

B. Rectangular glass slab

C. Prism

D. Convex lens

Answer 1

Answer :

D. Convex lens

Explanation :

• We know that convex lens is a converging lens.
• So, when the parallel rays of light pàss through the lens and refract at one point.
• This point is known as Principal Focus.
• As the rays meet at the focus and then spread out in opposite direction, a convex lens is present inside the box.
• In a convex lens the edges are curved outward rather than inward.

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Uses of Convex Lens :

1. Magnifying glasses.
2. Eyeglasses.
3. Cameras.
4. Microscopes.
5. Human Eye.

• The most prime example of the Convex lens in daily life is that it helps us see the world clearly with our eyes

Answer 2

Concave is correct as it diverges light
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