Question

if we want to make fire with the help of a lens using the rays of the sun,what kind of lens should be used and why?

Answer 1

Covex lens,as it converges

Go through the pic to understood better through diagram.

Hope it will help you @

Answer 2

Explanation:

So, if we want to make fire with the help of a lens using the rays of the sun, the kind of lens that will be used is convex lens which is also known as converging lens. The reason is that the light rays that come from the sun are almost parallel and they cross at the focal point of the lens. Therefore, it will burn the paper.