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apochromatic

[ap-uh-kroh-mat-ik, -oh-kruh-]

adjective

Optics.
  1. corrected for spherical aberration at two wavelengths or colors and for chromatic aberration at three wavelengths.



apochromatic

/ ˌæpəkrəˈmætɪk, ˌæpəˈkrəʊməˌtɪzəm /

adjective

  1. (of a lens) almost free from spherical and chromatic aberration

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Other Word Forms

  • apochromatism noun
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Word History and Origins

Origin of apochromatic1

First recorded in 1885–90; apo- + chromatic
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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In consequence of its low refractive and dispersive power, colourless pellucid fluor-spar is valuable in the construction of apochromatic lenses, but this variety is rare.

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Threads up to about one twenty-thousandth of an inch in diameter may be sufficiently well measured by means of a Zeiss "4 centimetre apochromatic object-glass" and an eyepiece "No. 6" with sixteen centimetre tube length.

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The best telescope objectives, and photographic objectives intended for three-colour work, are also apochromatic, even if they do not possess quite the same quality of correction as microscope objectives do.

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