Beams of light are incident through the holes A and B and emerge out of box through the holes C ndas...........

Physics Chapter - 10

Beams of light are incident through the holes A and B and emerge out of box through the holes C – and D respectively, as Box shown in the figure.

Which of the following could be inside the box?

A rectangular glass slab

A convex lens

A concave lens

A prism

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Explanation:

Here, the emergent rays are parallel to the direction of the incident ray. Therefore, a rectangular glass slab could be inside the box as the extent of bending of light ray at the opposite parallel faces AB (air-glass interface) and CD (glass-air interface) of the rectangular glass slab are equal and opposite. This is why the ray emerges parallel to the incident ray.

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