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 raysRay 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
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.
(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.
(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
(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.
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
- A colored pencil
(American English), coloured pencil
(Commonwealth English), pencil
crayon, lead or coloured/colouring lead (Newfoundland English) is an...
- 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
- to the curved
core boundary. Collimated
beam Paraxial approximation Pencil
beam Ray transfer matrix analysis
Moore, Ken (25 July 2005). "What is a ray...
- the index
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
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...
- 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
is made infinitely
(Medical physics) Ionizing radiation photons
or x-rays (IMRT) use pencil
to precisely target
a tumor. Bone scan densitometry...
- 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
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