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     EduGorilla 
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    Dispersive powers of materials used in lenses of an achromatic doublet are in the ratio 5:3. If the focal length of concave lens is 15 cm, then the focal length of the other lens will be

    Options :-

    1. -9 cm
    2. +9 cm
    3. -12 cm
    4. +12 cm
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