An achromatic combination of lenses produces

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(D) An achromatic combination of lenses is designed to minimize chromatic aberration.Chromatic aberration occurs because the refractive index $(\mu)$

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Images unaffected by variation of refractive index with wavelength

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(D) An achromatic combination of lenses is designed to minimize chromatic aberration.Chromatic aberration occurs because the refractive index $(\mu)$ of a lens material depends on the wavelength $(\lambda)$ of light, causing different colors to focus at different points.By combining two lenses of different materials (typically crown and flint glass) with specific focal lengths and dispersive powers, the chromatic aberration is corrected.Therefore, an achromatic combination produces images that are effectively free from color fringing caused by the variation of the refractive index with wavelength.

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