#optical_phenomenon__opticalphenomenon  a physical phenomenon related to or involving light
  supertype:  physical_phenomenon  a natural phenomenon involving the physics of matter and energy
  subtype:  optical_aberration__opticalaberration__aberration__distortion  an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
     subtype:  chromatic_aberration__chromaticaberration  an optical aberration in which the image has colored fringes
     subtype:  spherical_aberration__sphericalaberration  a optical aberration resulting in a distorted image
  subtype:  absorption_band  a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths
  subtype:  diffraction  when light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands
     subtype:  X-ray_diffraction  the scattering of X rays by the atoms of a crystal; the diffraction pattern shows structure of the crystal
  subtype:  incidence  the striking of a light beam on a surface; "he measured the angle of incidence of the reflected light"
  subtype:  optical_illusion__opticalillusion  an optical phenomenon that results in a false or deceptive visual impression
     subtype:  apparent_motion__motion__apparent_movement__movement  an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object; "the cinema relies on apparent motion"; "the succession of flashing lights gave an illusion of movement"
     subtype:  mirage.optical_illusion  an optical illusion in which atmospheric refraction by a layer of hot air distorts or inverts reflections of distant objects
        subtype:  fata_morgana  a mirage in the Strait of Messina (attributed to the Arthurian sorcerer Morgan le Fay)
  subtype:  pleochroism  the phenomenon of different colors appearing when certain crystals are viewed from different directions
     subtype:  dichroism  pleochroism of a crystal so that it exhibits two different colors when viewed from two different directions
     subtype:  trichroism  pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions
  subtype:  polarization__polarisation  the phenomenon in which waves of light or other radiation are restricted in direction of vibration
  subtype:  parallax  the apparent displacement of an object as seen from two different points that are not on a line with the object
     subtype:  heliocentric_parallax__annual_parallax  the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline
        subtype:  stellar_parallax__stellarparallax  the heliocentric parallax of a star
     subtype:  geocentric_parallax__diurnal_parallax__diurnalparallax  the parallax of a celestial body using two points on the surface of the earth as the earth rotates
        subtype:  horizontal_parallax  the maximum parallax observed when the celestial body is at the horizon
        subtype:  solar_parallax__solarparallax  the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit
  subtype:  Tyndall_effect  the phenomenon in which light is scattered by very small particles in its path; it makes a beam of light visible; the scattered light is mainly blue

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