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- Pencil_(optics) abstract "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. For example a phased array antenna can send out a beam that is extremely thin. Such antennas are used for tracking radar. In optics, the focusing action of a lens is often described in terms of pencils of rays. In addition to conical and cylindrical pencils, optics deals with astigmatic pencils as well.In electron optics, scanning electron microscopes use narrow pencil beams to achieve a deep depth of field.Ionizing radiation used in radiation therapy, whether photons or charged particles, such as proton therapy and electron therapy machines, is sometimes delivered through the use of pencil beam scanning.".
- Pencil_(optics) thumbnail Pencil_1675.png?width=300.
- Pencil_(optics) wikiPageID "3443204".
- Pencil_(optics) wikiPageRevisionID "544232323".
- Pencil_(optics) hasPhotoCollection Pencil_(optics).
- Pencil_(optics) subject Category:Antennas_(radio).
- Pencil_(optics) subject Category:Geometrical_optics.
- Pencil_(optics) subject Category:Radiation_therapy.
- Pencil_(optics) type BodyPart105220461.
- Pencil_(optics) type Eye105311054.
- Pencil_(optics) type GeometricalOptics.
- Pencil_(optics) type Organ105297523.
- Pencil_(optics) type Part109385911.
- Pencil_(optics) type PhysicalEntity100001930.
- Pencil_(optics) type SenseOrgan105299178.
- Pencil_(optics) type Thing100002452.
- Pencil_(optics) comment "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. For example a phased array antenna can send out a beam that is extremely thin. Such antennas are used for tracking radar.".
- Pencil_(optics) label "Pencil (optics)".
- Pencil_(optics) label "Pencil Beam".
- Pencil_(optics) sameAs Pencil_Beam.
- Pencil_(optics) sameAs 광선속.
- Pencil_(optics) sameAs m.09cps0.
- Pencil_(optics) sameAs Q2068617.
- Pencil_(optics) sameAs Q2068617.
- Pencil_(optics) sameAs Pencil_(optics).
- Pencil_(optics) wasDerivedFrom Pencil_(optics)?oldid=544232323.
- Pencil_(optics) depiction Pencil_1675.png.
- Pencil_(optics) isPrimaryTopicOf Pencil_(optics).
