achromatic lens

American  

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.

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Etymology

Origin of achromatic lens

Probably earlier than 1860–65

Example Sentences

Hampton, 237 W. Decatur St., Decatur, Ill., an electric motor, a 1-cell bichromate battery, a pair of skates, an achromatic lens and 2 fonts of type for a photo-camera lens, etc.

From Golden Days for Boys and Girls, Vol. XIII, Nov. 28, 1891 by Elverson, James

Photographic Query.—Given the diameter and focal length of a simple achromatic lens; at what distance from it must a diaphragm of given diameter be placed to give the best possible image?

From Notes and Queries, Number 235, April 29, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by Various

For average photography, the camera fitted with Kodak Ball Bearing shutter and tested meniscus achromatic lens is amply efficient, for it will make excellent pictures under ordinary conditions.

From Kodaks and Kodak Supplies 1914 by Canadian Kodak Company

If the web of a frog's foot be placed on the stage of a microscope and examined with an achromatic lens, the chromatophores can readily be made out.

From The Dawn of Reason or, Mental Traits in the Lower Animals by Weir, James

The two spectra do not coincide, and the result, if an achromatic lens be made of these glasses, must be a remnant of color which cannot be neutralized.

From Scientific American Supplement, No. 561, October 2, 1886 by Various