Category:Collimator

Col"li*ma`tor, n.

1. (Astron.)

Defn: A telescope arranged and used to determine errors of collimation, both vertical and horizontal. Nichol.

2. (Optics)

Defn: 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.