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09-01-2024
Mathematics

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A lens of refractive index n is put in a liquid of refractive index n′ of focal length of lens in air is f, its focal length in liquid will be

A −fn′(n−1)/n′−n
B −f(n′−n)/n′(n−1)
C −n′(n−1)/f(n′−n)
D fn′n/n−n′

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