A thin lens made of glass (refractive in...

A thin lens made of glass (refractive index "=1.5" ) of focal length "f=16cm" is immersed in a liquid of refractive index "1.42" .If its focal length in liquid is`f_(1)` ,then the ratio`f_(1)`/f` is closest to the integer

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A thin lens made of glass (refractive index "=1.5" ) of focal length "f=16cm" is immersed in a liquid of refractive index "1.42" .If its focal length in liquid is`f_(1)` ,then the ratio`f_(1)`/f` is closest to the integer

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