Question

why does obtaining the image of the sun on a paper with the help of a concave mirror burn the paper

Answer 1

because concave mirror focus thesunlight at one particular point . At that particular point , amount ofsunlight is converged and heat istrapped at that point . This is because , it burn the paper on which the image isfocussed .

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Answer 2

Concave mirror focuses the parallel sun rays at focal point of the mirror.

So with a small concave mirror we can heat up and burn a paper.
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