collimator

/K AH0 L IH1 M AH0 T ER0/
noun
  1. 1

    An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence.

  2. 2

    A similar device that produces a parallel beam of particles such as neutrons.

  3. 3

    A small telescope attached to a larger one, used to point it in the correct general direction.

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Source: https://en.wiktionary.org/wiki/collimator

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