Question

what is pencil in physics?​

Answer 1

Answer:

In optics, a pencil or pencil of rays 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 narrow cone or cylinder. Antennas which strongly bundle in azimuth and elevation are often described as "pencil-beam" antennas.

Explanation:

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Answer 2

Answer:

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‣In optics, a pencil or pencil of rays 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 narrow cone or cylinder. ... In optics, the focusing action of a lens is often described in terms of pencils of rays.