An achromatic combination of lenses produces

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(C) The image of an object in white light formed by a lens is usually coloured and blurred. This defect is called chromatic aberration and arises beca

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images unaffected by variation of refractive index with wavelength

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(C) The image of an object in white light formed by a lens is usually coloured and blurred. This defect is called chromatic aberration and arises because the focal length of a lens varies with the wavelength of light (dispersion). An achromatic combination of lenses is designed to minimize or eliminate this chromatic aberration. By combining two lenses of different materials (e.g.,crown glass and flint glass) such that their dispersive powers compensate for each other,the resulting image is free from color fringing. Therefore,the images produced by an achromatic combination are unaffected by the variation of the refractive index with wavelength.

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