21) when a concave 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 carbon paper. what is the name given to the distance between the mirror and carbon paper ? a)Radius of curvature b) focal length c) focus d) principal axis
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Explanation: a) The nature of the spherical mirror is a concave mirror. (b) The hole is burnt in the carbon paper because most of the sun's heat rays are focussed on the sun's image point and this can burn the carbon paper's hole.nation:
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