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

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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, also known as a pencil beam or narrow beam, is a geometric construct (pencil of half-lines) used to describe a...
- the system. Because 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...
- application of his Hamiltonian optics method. Consider a pencil of light rays in a homogenous medium that is perpendicular to some surface. P**** the pencil of rays...
- A colored pencil (American English), coloured pencil (Commonwealth English), colour pencil (Indian English), map pencil, pencil crayon, or coloured/colouring...
- Naming the central ray p****ing through the entrance pupil the axis of the pencil or prin****l ray, it can be said: the rays of the pencil intersect, not in...
- rays intersect the pupil at yp= 0. The prin****l ray is both sagittal and meridional. All other sagittal rays are skew rays. A paraxial ray is a ray that...
- 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...
- Literary Award in Poetry. Pardlo is the translator of the full-length poetry collection Pencil of Rays and Spike Mace by Danish poet Niels Lyngsø. Born...
- that the illusion is due to the fact "that an impression made by a pencil of rays on the retina, if sufficiently vivid, will remain for a certain time...
- notation of the present article, the second differential of the étendue, d2G , of the pencil of light which "connects" the two surface elements dA1 and...