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Question

Himanshu has two lenses A and B. When he touches both the lenses he finds that A is thicker at the centre than the edges and B are thinner at the centre as compared to its edges. He has to focus sunlight on a particular point. Which of the following statement is true?


A

He should use lens B

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B

He should use lens A

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C

Neither of the lenses can be used

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D

Insufficient information

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Solution

The correct option is B

He should use lens A


Himanshu should use lens A. Such a lens is the thickest at the middle and gradually becomes thinner towards its ends. Converges lens is used to focus sunlight on a particular point. A convex lens converges a beam of parallel rays of light after refraction through it.

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