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[" 9.Diameter of a plane convex lens is ...

[" 9.Diameter of a plane convex lens is "6cm" and thickness "],[" at the centre is "3mm" .If the speed of light is "2times10^(8)m/s" in "],[" the material of the lens,the focal length of the lens is "],[[" (a) "15cm," (b) "20cm],[" (c) "30cm," (d) "10cm]]

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