#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
  supertype:  optical_device__opticaldevice  a device for producing or controlling light
  part of:  prism_spectroscope__prismspectroscope__spectroscope  an optical instrument for spectrographic analysis

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