Question

why does obtaining a suns image on a paper with the help of concave mirror burns it​

Answer 1

Answer:

because concave mirror focus the sunlight at one particular point. at that particular point amount of sunlight is converged and heat is trapped at the point. this is because it burn the paper on which the image is focussed.

Answer 2

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When sun rays fall on the concave mirror, they converge and come together in the focal plane.

Due to convergence the intensity of sun rays increases.

Hence, image of the sun on a paper with the help of a concave mirror burn the paper.