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

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

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

It is fitted with the No. 0 Ball Bearing shutter, speed 1/50 of a second, with cable release, as described on page 6, and offers the choice of rapid rectilinear or meniscus achromatic lens.

From Kodaks and Kodak Supplies 1914 by Canadian Kodak Company

A similar argument may be applied to find at what point an achromatic lens becomes sensibly superior to a single one.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" by Various

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

From The Atlantic Monthly, Volume 12, No. 69, July, 1863 by Various