Question

Rahul and Ravi bought a mirror from one of the exhibitions that they recently visited.They held the mirror's reflecting surface towards the sun and directed the light reflected by the mirror on a sheet of paper.They held the mirror until they got a sharp bright spot of light on paper.After a few seconds the paper began burning producing smoke.
1)what type of mirror did they used to get the bright spot on the paper and why?
2)represent the condition using a ray diagram.

Answer 1

1) It's a concave mirror.it coverages the all light of sun on a single point.