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Collimator

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Webster Dictionary
• Collimator
• Collimation
• Collimating
•   (only first 3 shown)

(1):

(n.) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.

(2):

(n.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal.