collimator

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collimator [n]

1)	a small telescope attached to a large telescope to use in setting the line of the larger one

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scope collimate

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

Synonyms :

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optical_device prism_spectroscope

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