collimator

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• February 27. 2016 from wordnet.princeton.edu

  collimator — noun — english

  a small telescope attached to a large telescope to use in setting the line of the larger one

• February 27. 2016 from wordnet.princeton.edu

  collimator — noun — english

  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