About pencil

In optics, a pencil or pencil of rays, also known as a pencil beam or narrow beam, is a geometric construct used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a cone or cylinder.

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pencil

beam of electromagnetic radiation or charged particles

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About pencil

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Facts from Wikidata (CC0).

Not who you're looking for? Others named pencil: writing implement · 2016 Tamil film directed by Mani Nagaraj · family of geometric objects with a common property