optical : Idioms & Phrases

• (Opt.), the angle included between the optic axes of the two eyes when directed to the same point; sometimes called binocular parallax.

Webster 1913

• noun in a doubly refracting crystal, the line in the direction of which no double refraction occurs
  
  • a crystal may have either one or two optic axes
• noun a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
  principal axis.
  
  • in a normal eye the optic axis is the direction in which objects are seen most distinctly

WordNet

• . (Opt.) (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two.

Webster 1913

• noun an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
  distortion; aberration.
  

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• noun apparatus for observation and measurement of optical phenomena
  

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• (Opt.), a graduated circle used for the measurement of angles in optical experiments.

Webster 1913

• noun lens used to concentrate light on an object
  condenser.
  

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• noun optical glass of low dispersion and low refractive index
  optical crown; crown glass.
  

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• noun optical glass of low dispersion and low refractive index
  optical crown; crown glass.
  

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• noun (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
  absorbance; transmission density; photographic density.
  

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• noun a device for producing or controlling light
  

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• noun a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
  optical disc.
  

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• noun a disk coated with plastic that can store digital data as tiny pits etched in the surface; is read with a laser that scans the surface
  optical disc.
  

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• noun a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
  optical fiber; glass fiber; glass fibre.
  

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• noun a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
  optical fiber; glass fiber; glass fibre.
  

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• noun optical glass of high dispersion and high refractive index
  flint glass.
  

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• noun the combining of images from the two eyes to form a single visual percept
  fusion.
  

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• noun clear homogeneous glass of known refractive index; used to make lenses
  

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• noun an optical phenomenon that results in a false or deceptive visual impression
  

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• noun an instrument designed to aid vision
  

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• noun a lens that focuses the image in a camera
  camera lens.
  

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• noun an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light
  laser.
  

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• noun opacity to light
  

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• noun a physical phenomenon related to or involving light
  

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• noun optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
  prism.
  

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• noun a pyrometer that uses the color of the light emitted by a hot object
  pyroscope.
  

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• a surveyor's instrument with reflectors for laying off right angles.

Webster 1913

• noun an astronomical telescope designed to collect and record light from cosmic sources
  

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