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Glossary of Optics Terms
beginning with letter A
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aberration Tweet Definition of aberration Like Definition of aberration on Facebook
noun
  1. The act of wandering; deviation, especially from truth or moral rectitude, from the natural state, or from a type.
  • The of youth - Hall
Aberrations from theory - Burke
  1. A partial alienation of reason.
  • Occasional aberrations of intellect - Lingard
  • Whims, which at first are the aberrations of a single brain, pass with heat into epidemic form - I. Taylor
    1. (astronomy) A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer.
    2. (context, optics) The convergence to different focus, foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus.
    3. (physiology) The passage of blood or other fluid into parts not appropriate for it.
    4. The producing of an unintended effect by the glancing of an instrument, as when a shot intended for A glances and strikes B.
    5. (context, zoology, botany) atypical development or structure
    achromaticity Tweet Definition of achromaticity Like Definition of achromaticity on Facebook
    noun
    1. The state or quality of being achromatic.
    achromatic lens Tweet Definition of achromatic lens Like Definition of achromatic lens on Facebook
    noun
    1. (optics) A lens generally composed of two separate lenses, one convex and one concave and generally of different materials, in such a way that the chromatic aberration produced by one is corrected by the other.
    achromatism Tweet Definition of achromatism Like Definition of achromatism on Facebook
    noun
    1. the state or quality of being achromatic; as, the of a lens; achromaticity - w:John Pringle Nichol, John Pringle Nichol
    2. Free of colors, not emitting or separating into colors.
      1. achromatopia
    anaclastic Tweet Definition of anaclastic Like Definition of anaclastic on Facebook
    adjective
    1. Produced by the refraction of light, as seen through water.
    anaglyph Tweet Definition of anaglyph Like Definition of anaglyph on Facebook
    noun
    1. A decorative ornament worked in low relief.
    2. The three-dimensional effect created by spectacles that have usually one red and one bluish-green lens and a stereoscopically modified film.
    analyzer Tweet Definition of analyzer Like Definition of analyzer on Facebook
    noun
    1. One who, or that which, analyzes.
    anamorphic Tweet Definition of anamorphic Like Definition of anamorphic on Facebook
    adjective
    1. producing various optically distorted images
    2. of or relating to the gradual evolution of different types of organism
    aperture Tweet Definition of aperture Like Definition of aperture on Facebook
    noun
    1. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
    An aperture between the mountains. --Gilpin.
    The back aperture of the nostrils. --Owen.
    1. (optics) Something which restricts the diameter of the light path through one plane in an optical system.
    2. (context, astronomy, photography) The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100 cm aperture.
    Note: The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.
    apochromatic Tweet Definition of apochromatic Like Definition of apochromatic on Facebook
    adjective
    1. (optics) corrected for both chromatic aberration and spherical aberration
    apostilb Tweet Definition of apostilb Like Definition of apostilb on Facebook
    noun
    1. (physics) a unit of luminance, being the luminance of a perfectly diffusing surface emitting light at the rate of one lumen per square metre.
    astigmatism Tweet Definition of astigmatism Like Definition of astigmatism on Facebook
    noun
    1. (optics) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.
    2. (pathology) A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

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