A collimator turns light from a source near its focus into a nearly parallel beam. A slit of width produces an angular width approximately , where is the focal length.
Restricting the range of directions in a stream of light, chemical atoms or electrons, for example using a collimator.
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A collimator is an optical device used to narrow a beam of particles or waves. It ensures that the rays emitted from a source are parallel or nearly parallel, which helps improve the precision and focus of the beam in various applications.
