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[" 2.) Diameter of a plano-convex lens i...

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

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The diameter of a plano convex lens is 6 cm and thickness at the centre is 3 mm . If the speed of light in the material of the lens is 2 xx 10^8 m//s , what is the focal length of the lens ?