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     EduGorilla 
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    Two glasses have dispersive powers in the ratio 2 : 3. These glasses are used in the manufacturing of an achromatic objective of focal length 20 cm. What are the respective focal lengths of the two lenses of the objective?

    Options :-

    1. 6.67 cm, – 10 cm
    2. 7.5 cm, – 12.5 cm
    3. 9.67 cm, – 15 cm
    4. 12.5 cm, – 20 cm
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