#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
  supertype:  #optical_device__opticaldevice  a device for producing or controlling light
  part of:  #biprism  #prism_spectroscope  #telescope
  subtype:  #erecting_prism  a right-angled optical prism used to turn an inverted image upright

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