Definition of achromatic lens

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Photonics Dictionary

achromatic lens: An achromatic lens is a type of optical lens designed to minimize chromatic aberration, which is the inability of a lens to focus all colors of light to the same convergence point. Chromatic aberration can cause colored fringes or halos around objects viewed through lenses, particularly noticeable in high-contrast situations.

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Achromatic lenses are typically constructed by combining two different types of glass with differing dispersion properties. By carefully choosing these materials and their configurations, achromatic lenses are able to bring different wavelengths of light to a single focus, thereby reducing or eliminating chromatic aberration. This makes them especially useful in optical devices such as telescopes, microscopes, and cameras, where high-quality image resolution and color fidelity are important.

Also known as achromat.

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