The effective focal length of the lens combination shown in Fig. is `-60 cm`. The radii of
Channel: Doubtnut
Date: 02/08/2020

The effective focal length of the lens combination shown in Fig. is `-60 cm`. The radii of curvature of the curved surfaces of the plano-convex lenses are `12 cm` each and refractive index of the material of the lens is `1.5`. The refractive index of the liquid is :