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(B) Chromatic aberration occurs because the focal length of a lens depends on the wavelength of light. For a combination of two thin lenses in contact

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$f_R = f_v$

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(B) Chromatic aberration occurs because the focal length of a lens depends on the wavelength of light. For a combination of two thin lenses in contact,the condition for achromatism (elimination of chromatic aberration) is given by $\frac{\omega_1}{f_1} + \frac{\omega_2}{f_2} = 0$,where $\omega$ is the dispersive power and $f$ is the focal length.Specifically,for two lenses of different materials,the condition is $\frac{f_1}{\omega_1} + \frac{f_2}{\omega_2} = 0$. In the context of the focal lengths for red $(f_R)$ and violet $(f_v)$ light,the condition for the combination to be achromatic is that the dispersive power of the combination is zero,which effectively means the focal length of the combination is the same for both red and violet light,i.e.,$f_R = f_v$.

What condition must be satisfied by a combination of lenses to eliminate chromatic aberration?

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