A piece of paper kept in sunlight ignites using convex lens.
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If we want to burn a paper by focusing sunlight then we have to use converging lens which can converge all sunlight at a point called focus.
Thus Convex lens is used to burn paper.
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it concentrates the light energy to the one spot on the paper so that the heat energy accumulates on that one small spot of paper as the heat increase combustion will occur when the spot too hot and the paper will burn
ex: magnifying glass
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