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[" 9.) Diameter of the flat surface of a...

[" 9.) Diameter of the flat surface of a circular plano-convex lens is "6cm" and thickness at the centre is "],[3mm" .The radius of curvature of the curved part is approximately "],[[" (a) "15cm," (b) "20cm," (c) "30cm," (d) "10cm]]

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