Question

Can u tell that when place convex lens does the paper burn and when we replace it by concave does we get brightspot on paper

I'll mark u as brainlist if u give correct answer​

Answer 1

A convex lens can concentrate the sun's rays to a point and burn a piece of paper. This happens because magnifying lens is a converging lens , so it converges the rays of sunlight falling on it to a single point on the paper. Since the rays of sun are heat radiation, So it raises the temperature of the paper and thus it starts burning. Concave mirror converges the light rays to a single direction which cause excess heat but in case of convex mirror the light rays falling on it gets diverged and thus cannot point on any one direction.