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collimator
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…
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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
noun
A small telescope attached to a large telescope to use in setting the line of the larger one
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