A thin convex lens made from crown glass 2 has focal length

Last updated: 6/9/2023

A thin convex lens made from crown glass 2 has focal length f When it is measured in two different liquids having 5 refractive indices and it has the focal 4 3 lengths f and f respectively The correct relation between the focal lengths is 2014 1 f and both become negative 2 f f f 3 f f and f becomes negative 4 f f and f becomes negative