A concavo-convex lens is made of glass of refractive index `1.5.` The radii of curvature of its two surfaces are `30 cm` and `50

A concavo-convex lens is made of glass of refractive index `1.5.` The radii of curvature of its two surfaces are `30 cm` and `50 cm.` Its focal length when placed in a liquid of refractive index `1.4` is
A. `-407 cm`
B. `250 cm`
C. `125 cm`
D. `25 cm`

A concavo-convex lens is made of glass of refractive index `1.5.` The radii of curvature of its two surfaces are `30 cm` and `50 cm.` Its focal length

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