#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
  subtype:  erecting_prism  a right-angled optical prism used to turn an inverted image upright
  part of:  biprism  an optical device for obtaining interference fringes
  part of:  prism_spectroscope__prismspectroscope__spectroscope  an optical instrument for spectrographic analysis
  part of:  telescope__scope  a magnifier of images of distant objects

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