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

Derived Forms

• apochromatism, noun

Other Words From

• ap·o·chro·ma·tism [ap-, uh, -, kroh, -m, uh, -tiz-, uh, m], noun

Word History and Origins

Origin of apochromatic¹

First recorded in 1885–90; apo- + chromatic

Example Sentences

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.

From Project Gutenberg

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.

From Project Gutenberg

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.

From Project Gutenberg