Question

why does a paper start burning the bright spot for focus by a concave or convex lens after a short interval of time​

Answer 1

Answer:

We know that convex lens is the converging lens it focuses the light ray passing through it at one point as a result heat is focuses on one single point and hence paper starts burning

Step-by-step explanation:

hope it helps u....

Answer 2

Answer:

Covex lens are generally used to concentrate sun rays for burning purposes. The rays passing through it converges and the light is concentrated at a point. This light energy gets transformed to heat energy. Therefore, the paper start burning the bright spot for focus by a concave or convex lens after a short interval of time