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 the sunlight at one particular point . At that particular point , amount of sunlight is converged and heat is trapped at that point . This is because , it burn the paper on which the image is focussed.
Hope that this answer helps ^-^.

Answer 2

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 that point . This is because , it burn the paper on which the image is focussed .