chromatic aberration

chromatic aberration
the variation of either the focal length or the magnification of a lens system with different wavelengths of light, characterized by prismatic coloring at the edges of the optical image and color distortion within it. Also called chromatism.
[1825-35]

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▪ optics
 colour distortion in an image viewed through a glass lens. Because the refractive index of glass varies with wavelength, every property of a lens that depends on its refractive index also varies with wavelength, including the focal length, the image distance, and the image magnification. The change of image distance with wavelength is known as chromatic aberration, and the variation of magnification with wavelength is known as chromatic difference of magnification, or lateral colour. Chromatic aberration can be eliminated by combining a strong lens of low-dispersion (crown) glass with a weaker lens made of high-dispersion (flint) glass. Such a combination is said to be achromatic. This method of removing chromatic aberration was discovered in 1729 by Chester Hall (Hall, Chester Moor), an English inventor, and it was exploited vigorously in the late 18th century in numerous small telescopes (telescope). Chromatic variation of magnification can be eliminated by achromatizing all the components of a system or by making the system symmetrical about a central diaphragm. Both chromatic aberration and lateral colour are corrected in every high-grade optical system.

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Universalium. 2010.

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Look at other dictionaries:

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  • chromatic aberration — noun an optical aberration in which the image has colored fringes • Hypernyms: ↑aberration, ↑distortion, ↑optical aberration …   Useful english dictionary

  • chromatic aberration — noun Date: 1831 aberration caused by the differences in refraction of the colored rays of the spectrum …   New Collegiate Dictionary

  • chromatic aberration — noun an optical aberration, in which an image has coloured fringes, caused by differential refraction of light of different wavelengths …   Wiktionary

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