The effective focal length of the lens c...

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 :
.

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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 : .

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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 :
.