Question

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 figure below. Which of the following could be inside the box?

Box

• A. A rectangular glass slab
• B. A convex lens
• C. A concave lens
• D. A prism

Answer 1

The correct option is A

A rectangular glass slab

The explanation for the correct option:

($\mathrm{A}$) A rectangular glass slab

1. Lateral displacements occur with parallel rays, so there may be a rectangular glass plate inside the box.
2. The distance that the incident light is displaced after being bent through the glass plate is called lateral displacement.
3. When the incident ray is perpendicular to the incident point.
4. A rectangular sheet of glass breaks them and then breaks them again.

Hence, option ($\mathrm{A}$) is correct.

The explanation for incorrect options:

($\mathrm{B}$) A convex lens

1. When a parallel ray hits a converging lens, it converges as it passes through and merges at the opposite point.
2. Therefore, a convex lens is called a condensing lens.

Hence, option ($\mathrm{B}$) is incorrect.

($\mathrm{C}$) A concave lens

1. A concave lens diverges a straight light beam from the source to produce a reduced, upright virtual picture.
2. It can generate both physical and virtual pictures.
3. Concave lenses feature at least one curved surface on the interior.

Hence, option ($\mathrm{C}$) is incorrect.

($\mathrm{D}$) A prism

1. A prism is a three-dimensional object with the same ends.
2. This is a combination of flat surfaces, identical bases, and equal cross-sections.
3. The face of the prism is a parallelogram or rectangle with no base.

Hence, option ($\mathrm{D}$) is incorrect.