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A concavo convex lens is made of glass of refractive index 1.5.The radii of curvature of its two surfaces are 30 cm and 50 cm.Its focal length when placed in a liquid of refractive index 1.4 is????(ans.-1050 cm).Please explain fully.
(1/-1050)=((1.5/1.4)-1)((-1/30)-(1/50))
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