In the Chapter "More About Energy" ,
it's given that- a piece of paper catches fire when sunlight is made to fall on it through a convex lens , due to the Light Energy of the Sun.
How could Light Energy be responsible for raising the Temp. of Paper above it's Ignition Temperature : not the Heat Energy ?
Please refer to the given below link to get your answer:-
https://www.meritnation.com/ask-answer/question/a-convex-lens-can-burn-a-piece-of-paper-using-sunlight-give/light/1806954
https://www.meritnation.com/ask-answer/question/a-convex-lens-can-burn-a-piece-of-paper-using-sunlight-give/light/1806954