Question

how do a concave mirror can burn a paper?
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Answer 1

Explanation:

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Simple the concave mirror Burns a paper because it has ability to converse / focus all the sunrays at a point . So it burnes the paper . The Brainliest Answer! Because concave mirror acts as converging mirror n converge all the rays at focus which increases the temperature at focus causing paper to burn..

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Answer 2

when the sun rays fall on concave mirror the mirror merges all the rays to point at one particular point( principal focus). so when all rays fall on the same point on a paper due to the heat present in rays makes to burn the paper

hope you have got the answer