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
• B. He should use lens A
• C. Neither of the lenses can be used
• D. Insufficient information

Answer 1

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.