A thin equi-convex lens is made of glass...

A thin equi-convex lens is made of glass of refractive index `1.5` and its length is `0.2 m.` If it acts as a concave lens of `0.5 m` focal length when dipped in a liquid, the refractive index of the liquid is

`17/8`

`15/8`

`13/8`

`9/8`

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