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A thin equiconvex lens is made of a glass of refractive index 1.5 and its f

A thin equiconvex lens is made of a glass of refractive index 1.5 and its focal 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:

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