achromatism

American  

[ey-kroh-muh-tiz-uhm] / eɪˈkroʊ məˌtɪz əm /

noun

Optics.

1. freedom from color.

2. freedom from chromatic aberration, as in an achromatic lens.

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Etymology

Origin of achromatism

First recorded in 1790–1800; achromat(ic) + -ism

Example Sentences

Leonhard Euler in 1747 had suggested that achromatism might be obtained by the combination of glass and water lenses.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" by Various

He will find that he has not given exactly the proper curves to secure achromatism.

From Side-Lights on Astronomy and Kindred Fields of Popular Science by Newcomb, Simon

The absence of this error is termed achromatism, and an optical system so corrected is termed achromatic.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg

If all three constants of reproduction be achromatized, then the Gaussian image for all distances of objects is the same for the two colours, and the system is said to be in ``stable achromatism.''

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg

Newton failed to perceive the existence of media of different dispersive powers required by achromatism; consequently he constructed large reflectors instead of refractors.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg