Definition of Pencil of rays. Meaning of Pencil of rays. Synonyms of Pencil of rays

Here you will find one or more explanations in English for the word Pencil of rays. Also in the bottom left of the page several parts of wikipedia pages related to the word Pencil of rays and, of course, Pencil of rays synonyms and on the right images related to the word Pencil of rays.

Definition of Pencil of rays

Pencil of rays
Ray Ray, n. [OF. rai, F. rais, fr. L. radius a beam or ray, staff, rod, spoke of a wheel. Cf. Radius.] 1. One of a number of lines or parts diverging from a common point or center, like the radii of a circle; as, a star of six rays. 2. (Bot.) A radiating part of the flower or plant; the marginal florets of a compound flower, as an aster or a sunflower; one of the pedicels of an umbel or other circular flower cluster; radius. See Radius. 3. (Zo["o]l.) (a) One of the radiating spines, or cartilages, supporting the fins of fishes. (b) One of the spheromeres of a radiate, especially one of the arms of a starfish or an ophiuran. 4. (Physics) (a) A line of light or heat proceeding from a radiant or reflecting point; a single element of light or heat propagated continuously; as, a solar ray; a polarized ray. (b) One of the component elements of the total radiation from a body; any definite or limited portion of the spectrum; as, the red ray; the violet ray. See Illust. under Light. 5. Sight; perception; vision; -- from an old theory of vision, that sight was something which proceeded from the eye to the object seen. All eyes direct their rays On him, and crowds turn coxcombs as they gaze. --Pope. 6. (Geom.) One of a system of diverging lines passing through a point, and regarded as extending indefinitely in both directions. See Half-ray. Bundle of rays. (Geom.) See Pencil of rays, below. Extraordinary ray (Opt.), that one or two parts of a ray divided by double refraction which does not follow the ordinary law of refraction. Ordinary ray (Opt.) that one of the two parts of a ray divided by double refraction which follows the usual or ordinary law of refraction. Pencil of rays (Geom.), a definite system of rays. Ray flower, or Ray floret (Bot.), one of the marginal flowers of the capitulum in such composite plants as the aster, goldenrod, daisy, and sunflower. They have an elongated, strap-shaped corolla, while the corollas of the disk flowers are tubular and five-lobed. Ray point (Geom.), the common point of a pencil of rays. R["o]ntgen ray(Phys.), a kind of ray generated in a very highly exhausted vacuum tube by the electrical discharge. It is capable of passing through many bodies opaque to light, and producing photographic and fluorescent effects by which means pictures showing the internal structure of opaque objects are made, called radiographs, or sciagraphs

Meaning of Pencil of rays from wikipedia

- 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...
- The grease pencil, a wax writing tool also known as a wax pencil, china marker or chinagraph pencil (especially in the United Kingdom), is a writing implement...
- to the curved core boundary. Collimated beam Paraxial approximation Pencil beam Ray transfer matrix analysis Moore, Ken (25 July 2005). "What is a ray...
- A colored pencil (US-English), coloured pencil (UK-English, Canada-English), pencil crayon (UK-English, Canada-English), lead or coloured/colouring lead...
- illusion that one is seeing the graphite embedded within the body of the pencil. X-Ray Specs were long advertised with the slogan "See the bones in your hand...
- the index of refraction is included, the NA of a pencil of rays is an invariant as a pencil of rays p****es from one material to another through a flat...
- A sketch (ultimately from Gr**** σχέδιος – schedios, "done extempore") is a rapidly executed freehand drawing that is not usually intended as a finished...
- the system) is, in general, even then not sharply reproduced if the pencil of rays issuing from it and traversing the system is made infinitely narrow...
- A penciller (or penciler) is a collaboration artist who works in creation of comic books, graphic novels, and similar visual art forms, with focus on primary...
- A cardioid (from the Gr**** καρδία "heart") is a plane curve traced by a point on the perimeter of a circle that is rolling around a fixed circle of the...
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