A lens x has focal length 20cm and lens y has focal length 40cm. Which lens would u select to obtain a more convergent beam of light and why?
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Focal length of any lens is the point where light converges. So, if focal length is more then the lens has converged the light to a larger distance that is it has converged less. Whereas, if the focal length is less then the light is converged at a smaller distance that is converged more.So, we can affirm that lens of 20 cm should be used to converge light to a larger extent.
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lens X which has the focal length of 20 cm.
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