Achromatic lens

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.
Historical Examples

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

If not, the substitution of an achromatic lens will be of no advantage.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 Various

A similar argument may be applied to find at what point an achromatic lens becomes sensibly superior to a single one.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 Various

It was this accuracy of convergence of the light which led Dr. Draper to prefer the mirror to the achromatic lens.
Atlantic Monthly, Vol. XII. July, 1863, No. LXIX. Various

achromatic lens n.
A combination of lenses made of different glass, used to produce images free of chromatic aberrations.


Read Also:

  • Achromatic objective

    achromatic objective achromatic objective n. An objective that is corrected for two colors chromatically and for one color spherically.

  • Achromatic prism

    a system of two or more prisms of different substances that deflects but does not disperse a beam of light.

  • Achromatic vision

    achromatic vision achromatic vision n. See achromatopsia.

  • Achromaticity


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