col|li|ma|tor

col|li|ma|tor
col|li|ma|tor «KOL uh MAY tuhr», noun. Optics.
1. a small fixed telescope with cross hairs at its focus, used for adjusting the line of sight of other instruments.
2. a) the tube with a slit and lens used in the spectroscope to collect the light and throw it upon the prism in parallel rays: »

The slit is at the focus of the objective of this telescope, the collimator, so that the rays are parallel as they enter the prism (Robert H. Baker).

b) the lens itself.

Useful english dictionary. 2012.

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