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  4. Two lenses in contact form an achromatic lens. Their focal lengths are in the ratio 2: 3. Their dispersive powers must be in ratio of

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Q. Two lenses in contact form an achromatic lens. Their focal lengths are in the ratio 2 : 3. Their dispersive powers must be in ratio of

Ray Optics and Optical Instruments

Solution:

$\frac{\omega_1}{f_1}+\frac{\omega_2}{f_2}=0$