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The Collaborative International Dictionary of English v.0.48 (gcide)

Achromatic \Ach`ro*mat"ic\, a. [Gr. 'achrw`matos colorless; 'a
priv. chrw^ma, chrw`matos, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
decomposing it into its primary colors.
[1913 Webster]

2. (Biol.) Uncolored; not absorbing color from a fluid; --
said of tissue.
[1913 Webster]

{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.
[1913 Webster]


Microscope \Mi"cro*scope\, n. [Micro- -scope.]
An optical instrument, consisting of a lens, or combination
of lenses, for making an enlarged image of an object which is
too minute to be viewed by the {naked eye}.
[1913 Webster]

{Compound microscope}, an instrument consisting of a
combination of lenses such that the image formed by the
lens or set of lenses nearest the object (called the
objective) is magnified by another lens called the ocular
or eyepiece.

{Oxyhydrogen microscope}, and {Solar microscope}. See under
{Oxyhydrogen}, and {Solar}.

{Simple microscope}, or {Single microscope}, a single convex
lens used to magnify objects placed in its focus.
[1913 Webster]

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