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

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

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

From Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis by Michelson, Albert A.

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

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