collimator

Noun
  1. A small telescope attached to a large telescope to use in setting the line of the larger one (synset 103074858)
    is a type of: scope, telescope - a magnifier of images of distant objects
  2. 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 (synset 103074591)
    is a type of: optical device - a device for producing or controlling light
    is a part of: prism spectroscope, spectroscope - an optical instrument for spectrographic analysis

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