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  4. Two lenses of focal lengths +10 cm and -15 cm are put in contact to form an achromatic combination. The ratio of their dispersive power is:

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Q. Two lenses of focal lengths +10 cm and -15 cm are put in contact to form an achromatic combination. The ratio of their dispersive power is:

Ray Optics and Optical Instruments

Solution:

$\frac{\omega _1}{\omega _2} =- \frac{f_1}{f_2}$