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?
Answers
Answered by
32
Answer:
a) convex lens
b) focal length
c) i think black colour reflects light while white colour absorbs most of the light.(not sure about the third part)
Explanation:
a) the sun's rays are converging at the focus (because the sun is at infinity). So, the lens is a converging lens.
b) the rays from infinity converge at the focus. So, the distance btw the paper and the lens is equal to the focal length.
c) don' know about c
Answered by
19
Explanation:
a) Convex lens
b) The focus
c) Rather than a white paper because black paper is good observer of heat ultimately paper burns
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Mark as brainlist plz
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