Question

why does obatining the image of the sun on a paper with the help of a concave mirror burn the paper?​

Answer 1

Answer:

The rays from the sun are parallel. When these rays fall on the concave mirror, they are converged to a single point on the focal plane of the mirror. ... Now, if a paper is placed at that point to get image of sun, the papers gets burnt because of huge amount of heat concentrated at that point.