achromatic lens

noun

, Optics.

1. a system of two or more lenses that is substantially free from chromatic aberration and in which the lenses are made of different substances so that the focal length of the system is the same for two or three wavelengths of light.

Word History and Origins

Origin of achromatic lens¹

Probably earlier than 1860–65

Example Sentences

The achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass.

From Project Gutenberg

If not, the substitution of an achromatic lens will be of no advantage.

From Project Gutenberg

In conclusion, what is the average time with single achromatic lens, six or seven inch focus, to allow to get a good picture?

From Project Gutenberg

The eye-piece consists of a single achromatic lens, whose focal length is about two inches.

From Project Gutenberg

It was this accuracy of convergence of the light which led Dr. Draper to prefer the mirror to the achromatic lens.

From Project Gutenberg