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     EduGorilla 
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    The dispersive powers of materials of two lenses are in the ratio 4 : 3. If the achromatic combination of these two lenses in contact is a convex lens of focal length 60 cm, then the focal lengths of the component lenses are

    Options :-

    1. − 20 cm and − 25 cm
    2. − 15 cm and + 120 cm
    3. + 15 cm and − 20 cm
    4. − 20 cm and + 25 cm
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