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The dispersive powers of glasses of lenses used in an achromatic converging pair are in...

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The dispersive powers of glasses of lenses used in an achromatic converging pair are in the ratio of 5 3 If focal length of concave len 15 cm then nature and focal length of other lens will be O Convex 9 cm O Concave 3 cm O Concave 12 cm O Concave 9 cm

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