29 Diameter of a plano convex lens is 6 cm and its thickness at the...
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29 Diameter of a plano convex lens is 6 cm and its thickness at the centre is 3 mm Then the focal length of the lens if the speed of light in the material of lens is 2 x 108 m s 1 7 5 cm 3 45 cm 2 15 cm 4 30 cm
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