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When a spherical mirror is held towards the sun and its sharp image is formed on a piece of carbon paper for some time, a hole is burnt in the carbon paper.(a) What is the nature of spherical mirror?(b) Why is a hole burnt in the carbon paper?(c) At which point of the spherical mirror the carbon paper is placed?(d) What name is given to the distance between spherical mirror and carbon paper?(e) What is the advantage of using a carbon paper rather than a white paper?
(a) The spherical mirror is concave.
(b) A hole is burnt in the carbon paper, because a concave mirror converges light rays, and in this case, it converges a lot of heat rays coming from the sun and concentrates at the point of the sun’s image which burns the hole in carbon paper.
(c) The carbon paper was kept at the focus of the spherical mirror so that all the heat containing light rays can be concentrated at a point.
(d) The name given to the distance between the mirror and the carbon paper is the focal length.
(e) The advantage of using carbon paper rather than white paper is that carbon paper is a good absorber of sunlight, and hence, it burns quickly.
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Updated on: 10-Oct-2022
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