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A concavo-convex lens is made of glass o...

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`

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The correct Answer is:
a
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