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A plano-convex lens when silvered on the...

A plano-convex lens when silvered on the plane side behaves like a concave mirror of focal length 60 cm. However when silvered on the convex side it behaves like a concave mirror of focal length 20 cm. Then the refractive index of the lens

A

`9//14`

B

`14//9`

C

`17//9`

D

None

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