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In a achromatic lens the phenomenon of chromatic aberration has been corrected. Achromatic means lacking color.
As the refractive index varies with the wavelength, the focal length of a lens also varies, and produces axial or longitudinal 'chromatic aberration'. Each wavelength forms an image of slightly different size; This produces what is known by lateral chromatic aberration. By combinations (called achromatic) of convergent and divergent lenses made of glasses of different dispersion it is possible to minimize chromatic aberration.
In general, chromatic aberration for two or three specific colors is corrected in achromatic lenses.
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