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achromatic

achromatic  

Describing a lens consisting of two or more optical components (elements), intended to correct for chromatic aberration. Commonly used as the objective of small refractors, the achromatic lens (or ...
anastigmatic lens

anastigmatic lens  

1. An objective lens for an optical instrument in which all aberrations, including astigmatism, are reduced greatly.2. A spectacle lens designed to correct astigmatism. It has different radii of ...
aperture

aperture  

The diameter of the main lens or mirror of a telescope, or, in radio astronomy, of the collecting dish. For Schmidt cameras, however, it is the diameter of the corrector plate. See also Unfilled ...
aplanatic

aplanatic  

Describing a lens or optical system that is free from both spherical aberration and coma (see Coma, Optical). Examples of aplanatic systems include some types of achromatic lens and the ...
coma

coma  

The diffuse shell of gas, typically about 150 000 km in diameter, which surrounds the nucleus of a comet. The coma and the nucleus form the ‘head’ of the comet.
distortion

distortion  

The extent to which a system fails to reproduce the characteristics of its input in its output. It is most commonly applied to electronic amplifiers and to optical systems. See aberration.
mirror

mirror  

All done with mirrors an apparent achievement with an element of trickery, alluding to explanations of the art of a conjuror.Mirror, mirror on the wall, Who is the fairest of them all? in the early ...

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