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Question

if refractive index from air to glass is 3/2 and from air to water is 4/3 , find the ratio of focal length of a glass lens in water and in air.

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Solution

Dear student,

Given that,
μw=43, μg=32By lens maker formula, we know that, 1Fairμg-11Fwaterμgμw-1FwaterFair=μwμg-1μg-μw=4332-132-43=4

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