Question

when the convex lens is covered with half black paper explanation with a diagram

Answer 1

The convex lens will form a complete image of an object, even if its one-half is covered with black paper. It can be understood by the following two
cases:
Case I: When the upper half of the lens is covered:
In this case, the rays of light coming from the object will be refracted by the lower half of the lens. These rays meet at the other side of the lens to form
the image of the given object, as shown in the figure.

Case II: When the lower half of the lens is covered:
In this case, a ray of light coming from the object is refracted by the upper half of the lens. These rays meet at the other side of the lens to form the
image of the given object, as shown in the figure.

The only difference between the image will be that it will have less intensity.

Answer 2

a complete image will form ;when one half of the lens is coverd the other half part of thevlens refract light rays through it and contributes to the final image .

the intensity of the image is half.

because somevof the rays from large no of incident light ray are refracted through the uncovered part of the lens but other raysvare blocked by the coverd part of lens
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