# The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. Calculate (i) the radius of curvature of lens surface and (

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The focal length of a plano-convex lens is 20 cm in air. Refractive index of glass is 1.5. Calculate (i) the radius of curvature of lens surface and (ii) its focal length when immersed in liquid of refractive index 1.6

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Correct Answer - (i) -10 cm (ii) -160 cm