To remove the chromatic aberration,the combin | vedclass

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(D) Chromatic aberration occurs in a lens because the focal length and refractive index vary for different colors of light.For a combination of lenses

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$F_R - F_V = 0$

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(D) Chromatic aberration occurs in a lens because the focal length and refractive index vary for different colors of light.For a combination of lenses to be achromatic (free from chromatic aberration),the equivalent focal length for red light $(F_R)$ must be equal to the equivalent focal length for violet light $(F_V)$.Mathematically,this condition is expressed as $F_R = F_V$,which implies $F_R - F_V = 0$.

To remove the chromatic aberration,the combination of lenses should be such that

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