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Q.

Is it true that a convex lens which concentrates the sun’s light on a paper can make the paper catch fire?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True
By focusing the light energy onto a small area of paper, convex lenses allow the light rays to concentrate on the focus. As the spot gets hotter, combustion occurs, and the paper starts to burn.
 
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