A thin lens made of glass refractive index 1 5 of focal

Last updated: 6/8/2023

A thin lens made of glass refractive index 1 5 of focal length f 16 cm is immersed in a liquid of refractive index 1 42 If its focal length in liquid is f then the ratio f f is closest to the integer 1 1 2 5 3 9 4 17