Question

28. 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
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Answer 1

beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in Figure 10.4. Which of the following could be inside the box? Explanation: Answer is concave lens because incident rays are parallel and emergent rays are diverging.

Explanation:

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Answer 2

Of the following (d) Convex lens could be inside the box.

• Of the following given options, the Convex lens could be inside the box because all the rays converge at the side B and then emerge out of the hole on the other face of the box. The point on side B is the focus of the convex lens.
• Since of all the given lenses, it is only the convex lens that enables the rays to converge at one point. So the answer is (d) Convex lens.