Question

When a spherical lens is held towards the sun a sharp image is formed on a piece of black paper a hole gets burnt in the black paper, after some time.

a) Name the lens used.

b) What name is given to the distance between the spherical and the black paper?

c) What is the relative advantage of using a black paper rather than white paper?.​

Answer 1

Answer:

Black paper is effective then white paper because black color absorbs heat more easily then white color and we can get the hole faster . Convex lens is a converging lens

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