Question

One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

Answer 1

A convex lens forms a complete image of an object even when half of it is covered by black paper. This can be understood through the following two scenarios.
Scenario I:
When the upper half of the lens is covered:
Light rays originating from the object are refracted by the lower half of the lens. These refracted rays converge on the opposite side of the lens, creating the image of the object, as illustrated in the accompanying figure.

Scenario II:
When the lower half of the lens is covered:
In this situation, light rays from the object are refracted by the upper half of the lens. These rays then converge on the other side of the lens, forming the image of the given object, as depicted in the following figure.