Question

A lens which can be used for converting light energy into heat energy is
1)Convex lens
2)Concave lens
3)Both convex as well as concave
4)Lens can't cause this transformation​

Answer 1

Answer:

Lens cannot cause this transformation.

Answer 2

Answer:

Convex lens

It is so because it converges the light rays so an object kept at its focus becomes hot because a convex lens converts light energy to heat energy

I hope I was able to solve your doubt