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

One is painted with the most brilliant hues of Romanticism, and glows with the essence of the Romantic spirit--Aspiration; the other looks at life through an achromatic lens, and is a catalogue of Realities.

From Essays on Russian Novelists by Phelps, William Lyon

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

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

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

Calculation shows that, if the aperture be 1⁄5 in., an achromatic lens has no sensible advantage if the focal length be greater than about 11 in.

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