When sun rays fall on the convex lens they get converged to a point. ... These rays surely have heat energy and they get accumulated in that point. When the amount of rays have accumulated enough so as to reach the ignition temperature of paper, the paper catches fire. Thus the paper is burnt
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When sun rays fall on the convex lens they get converged to a point. ... These rays surely have heat energy and they get accumulated in that point. When the amount of rays have accumulated enough so as to reach the ignition temperature of paper, the paper catches fire. Thus the paper is burnt