#optical_device__opticaldevice  a device for producing or controlling light
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  biprism  an optical device for obtaining interference fringes
  subtype:  camera_lucida  an optical device consisting of an attachment that enables an observer to view simultaneously the image and a drawing surface for sketching it
  subtype:  coelostat  optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror
  subtype:  collimator  optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam
  subtype:  diffraction_grating__diffractiongrating__grating  optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum
     subtype:  echelon  a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
  subtype:  diffuser__diffusor  optical device that distributes the light of a lamp evenly
  subtype:  view_finder__finder  optical device that helps a user to find the target of interest
  subtype:  Kerr_cell  optical device consisting of a transparent cell with two electrodes between two polarizing media; passes light only if the two planes of polarization are parallel; used as a high-speed shutter or to modulate a laser beam
  subtype:  laser__optical_maser__opticalmaser  (Light Amplification by Stimulated Emission of Radiation) optical device that produces an intense monochromatic beam of coherent light
  subtype:  lens_system__lens  a transparent optical device used to converge or diverge transmitted light and to form images
     subtype:  anastigmat  compound lens or lens system designed to be free of astigmatism and able to form approximately point images
     subtype:  anastigmatic_lens  a lens designed to correct astigmatism
     subtype:  camera_lens__optical_lens  a lens that focuses the image in a camera
        subtype:  closeup_lens  a photographic lens with a short focal length used to take pictures at short ranges
        subtype:  portrait_lens  a compound camera lens with a relatively high aperture
        subtype:  telephoto_lens__zoom_lens  a camera lens that magnifies the image
        subtype:  wide-angle_lens__fisheye_lens  a camera lens having a wider than normal angle of view (and usually a short focal length); produces an image that is foreshortened in the center and increasingly distorted in the periphery
     subtype:  compound_lens  a lens system consisting of two or more lenses on the same axis
        subtype:  achromatic_lens__achromaticlen  a compound lens system that forms an image free from chromatic aberration
     subtype:  optical_condenser__opticalcondenser__condenser  lens used to concentrate light on an object
        subtype:  Abbe_condenser  a condenser having 2 or 3 lenses with wide aperture for use in microscopes
     subtype:  contact_lens  a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication
     subtype:  converging_lens__convex_lens  lens such that a beam of light passing through it is brought to a point or focus
     subtype:  crown_lens  a lens made of optical crown glass
     subtype:  diverging_lens__concave_lens  a lens such that a parallel beam of light passing through it is caused to diverge or spread out
     subtype:  eyepiece__ocular  combination of lenses at the viewing end of optical instruments
     subtype:  Fresnel_lens  lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length
     subtype:  intraocular_lens  an artificial lens that is implanted into the eye of someone to replace a damaged natural lens or someone who has had a cataract removed
     subtype:  monocle__eyeglass  lens for correcting defective vision in one eye; held in place by facial muscles
     subtype:  object_glass__objective  the lens or system of lenses nearest the object being viewed
  subtype:  Nicol_prism  optical device that produces plane-polarized light
  subtype:  planetarium.optical_device  an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
  subtype:  polarimeter__polariscope  an optical device used to measure the rotation of the plane of vibration of polarized light
  subtype:  optical_prism__opticalprism__prism  optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
     subtype:  erecting_prism  a right-angled optical prism used to turn an inverted image upright
  subtype:  projector.optical_device  an optical device for projecting a beam of light
  subtype:  Rochon_prism__Wollaston_prism  optical device that produces plane-polarized ultraviolet light
  subtype:  stereoscope  an optical device for viewing stereoscopic photographs
  subtype:  viewer  an optical device for viewing photographic transparencies

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