Q.

Is it true that a convex lens is used to burn a piece of paper by using sunlight?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
A convex lens is a type of lens that is thin at its edges and thick in the middle. Due to the converging nature of the convex lens, it is also known as a converging lens. The convex lens concentrates the light energy to one spot on the paper. The heat is accumulated on a single spot and spreads to the whole paper. Hence, the piece of paper can be burned by using a convex lens and sunlight.
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