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. (a) Name the lens used in the above activity. (b) What name is given to the distance between the spherical lens and the black paper? (c) What is the relative advantage of using a black paper rather than a white paper?
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Concave mirror
A lot of sun's heat rays are concentrated at the point of sun's image which burn the hole in carbon paper.
At the focus
Focal length
A black carbon paper absorbs more heat rays and hence burns a hole more easily (than a white paper).
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