Question

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

1. name the lens used in the above activity .
2.what name is given to the distance between the spherical lens and the black paper ?
3.what is the relative advantage of using black paper rather than using a white paper ?​

Answer 1

Answer:

When a spherical lens is held towards the sun and a sharp image is formed on a piece of black paper, a hole gets burnt in the black paper , after some time . 1) what name is given to the distance between the spherical lens and the black paper

Ask