The dispersive powers of materials of two lenses are in the ratio 4 : 3. If the achromatic combinati….

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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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