Achromatism

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Achromatism ( listen ? / I ) or Achromasie (Greek. For, colorless') referred to in the optical property of optical elements , white light as it passes not in spectral colors to disassemble or without chromatic aberration to break . Audio file / audio sample

Optical elements such as lenses or prisms generally have a wavelength-dependent refractive index (see dispersion ), which leads to different deflection angles for light of different wavelengths or spectral colors ( angular dispersion ). This effect is also spectral , color separation or color dispersion called. For lenses, this leads to an aberration , known as chromatic aberration is called. In contrast, prisms are used in prism spectrometers precisely because of this effect .

By suitable combination of several such dispersive optical elements (e.g. two prisms or two lenses of different materials), the color scattering of the first element can be canceled out again by that of the second without the deflection itself being canceled. Prisms of this type cemented together are called an achromatic prism , and such a lens is called an achromat .

literature

  • Achromatism . In: Otto Lueger (Ed.): Lexicon of the entire technology and its auxiliary sciences . tape 1 . Stuttgart / Leipzig 1904, p. 61–63 ( full text on zeno.org ).

Individual evidence

  1. achromatism . Duden-online
  2. Eugene Hecht: Optics . Oldenbourg Verlag, 2005 ( limited preview in Google Book Search).
  3. achromatism . In: Otto Lueger (Ed.): Lexicon of the entire technology and its auxiliary sciences . tape 1 . Stuttgart / Leipzig 1904, p. 61–63 ( full text on zeno.org ).