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

A thin equiconvex lens is made of glass of refractive index 1.5 and its focal length in air is 0.2m if it acts as a concave lens of 0.5 m focal length when dipped in a liquid,the velocity of light in the liquid is?what is the formula used?

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