#prism_spectroscope__prismspectroscope__spectroscope  an optical instrument for spectrographic analysis
  supertype:  optical_instrument__opticalinstrument  an instrument designed to aid vision
  subtype:  mass_spectrometer  spectrograph
  part:  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
  part:  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

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