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

The effective focal length of the lens combination shown in figure -60

1.	The effective focal length of the lens combination shown in figure -60cm. The radii of curvature of the curved surface of the plano-convex lenses are 12cm each and refractive index of the material of the lens is 1.5. The refractive index of the liquid is
Answer» 1.33 1.42 1.53 `1.60` ANSWER :D