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[" 23.The radii of curvature of a double...

[" 23.The radii of curvature of a double convex lens are "15cm],[" and "30cm" and its refractive index is "1.5" .Calculate its focal "],[" length."(H.S.S.C.E.1999)" [Ans."20cm]],[" 24.The radii of "]

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