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Q.

Is it true that the paper will burn if sunlight is concentrated on the paper placed at the principal focus of the convex lens?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
When sunlight is concentrated on the paper placed at the principal focus of the convex lens, the paper will burn. This is because the sun's heat energy is concentrated on the small part of the paper, which is also the principal focus of the lens, and here the convex lens forms the sharp image of the sun.
 
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Is it true that the paper will burn if sunlight is concentrated on the paper placed at the principal focus of the convex lens?