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A  ›  achromatic
A  ›  achromatic
1828 Definition

ACHROMAT'IC, a. [Gr. priv. and color.]

Destitute of color. achromatic telescopes are formed of a combination of lenses, which separate the variously color rays of light to equal angles of divergence, at different angles of refraction of the mean ray. In this case, the rays being made to refract towards contrary parts, the whole ray is caused to deviate from its course, without being separated into colors, and the optical aberration arising from the various colors of light, is prevented. This telescope is an invention of Dolland.
1913 Definition
Achromatic (achromatic)
a.((?))
Ach`ro*mat"ic
[Gr. (?) colorless; 'a priv. + (?), (?), color: cf. F. achromatique.]
  1. Free from color; transmitting light without decomposing it into its primary colors.
  2. Uncolored; not absorbing color from a fluid; -- said of tissue.

    Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. -- Achromatic prism. See Prism. -- Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.


1828 dictionary
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