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Question

Convex lens of very short focal length will make:


A

Higher divergence of light rays

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B

Lesser divergence of light rays

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C

Lesser convergence of light rays

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D

Higher convergence of light rays

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Solution

The correct option is D

Higher convergence of light rays


For the same aperture, as the curvature decreases, focal length of the convex lens increases. Therefore, focal length of lens 2 is greater than lens 1. Clearly, lens 1 bends the light rays more, hence smaller focal length means higher convergence.


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