rus: коллиматор

Information
has URI	http://lexvo.org/id/term/rus/%D0%BA%D0%BE%D0%BB%D0%BB%D0%B8%D0%BC%D0%B0%D1%82%D0%BE%D1%80

Meaning
means	(noun) 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 collimator
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means	(noun) a small telescope attached to a large telescope to use in setting the line of the larger one collimator