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[" The radius curvature of a thin plano-...

[" The radius curvature of a thin plano-convex lens is "10cm" (of curved surface) and the "],[" refractive index is "1.5" .If the plane surface is silvered,then the focal length will be "],[[" (a) "15cm," (b) "20cm],[" (c) "5cm," (d) "10cm]]

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