Question

4.
When a spherical lens is held towards the Sun and a sharp image is formed on
(b) What name is given to the distance between the spherical lens and the black
a piece of black paper, a hole gets burnt in the black paper, after some time.
(a) Name the lens used in the above activity.
paper?
(c) What is the relative advantage of using a black paper rather than a white
paper?​

Answer 1

Answer:

c) because black papers absorb the heat fastly