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Noun
collimator
Definition: a small telescope attached to a large telescope to use in setting the line of the larger one
collimator
Definition: 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
Definition: An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence.