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Aplanatic focusFocus Fo"cus, n.; pl. E. Focuses, L. Foci. [L. focus
hearth, fireplace; perh. akin to E. bake. Cf. Curfew,
Fuel, Fusil the firearm.]
1. (Opt.) A point in which the rays of light meet, after
being reflected or refrcted, and at which the image is
formed; as, the focus of a lens or mirror.
2. (Geom.) A point so related to a conic section and certain
straight line called the directrix that the ratio of the
distace between any point of the curve and the focus to
the distance of the same point from the directrix is
constant.
Note: Thus, in the ellipse FGHKLM, A is the focus and CD the
directrix, when the ratios FA:FE, GA:GD, MA:MC, etc.,
are all equal. So in the hyperbola, A is the focus and
CD the directrix when the ratio HA:HK is constant for
all points of the curve; and in the parabola, A is the
focus and CD the directrix when the ratio BA:BC is
constant. In the ellipse this ratio is less than unity,
in the parabola equal to unity, and in the hyperbola
greater than unity. The ellipse and hyperbola have each
two foci, and two corresponding directrixes, and the
parabola has one focus and one directrix. In the
ellipse the sum of the two lines from any point of the
curve to the two foci is constant; that is:
AG+GB=AH+HB; and in the hyperbola the difference of the
corresponding lines is constant. The diameter which
passes through the foci of the ellipse is the major
axis. The diameter which being produced passes through
the foci of the hyperbola is the transverse axis. The
middle point of the major or the transverse axis is the
center of the curve. Certain other curves, as the
lemniscate and the Cartesian ovals, have points called
foci, possessing properties similar to those of the
foci of conic sections. In an ellipse, rays of light
coming from one focus, and reflected from the curve,
proceed in lines directed toward the other; in an
hyperbola, in lines directed from the other; in a
parabola, rays from the focus, after reflection at the
curve, proceed in lines parallel to the axis. Thus rays
from A in the ellipse are reflected to B; rays from A
in the hyperbola are reflected toward L and M away from
B.
3. A central point; a point of concentration.
Aplanatic focus. (Opt.) See under Aplanatic.
Conjugate focus (Opt.), the focus for rays which have a
sensible divergence, as from a near object; -- so called
because the positions of the object and its image are
interchangeable.
Focus tube (Phys.), a vacuum tube for R[oe]ntgen rays in
which the cathode rays are focused upon the anticathode,
for intensifying the effect.
Principal, or Solar, focus (Opt.), the focus for parallel
rays. Aplanatism
Aplanatism A*plan"a*tism, n.
Freedom from spherical aberration.
ComplanarComplanar Com*pla"nar, a.
See Coplanar. ComplanateComplanate Com"pla*nate (? or ?), a. [L. complanatus, p. p. of
complanare to make plane. See Plane, v. t.]
Flattened to a level surface. [R.] Complanate
Complanate Com"pla*nate, v. t.
To make level. [R.]
DeplanateDeplanate De*pla"nate, a. [L. deplanetus, p. p. of deplanare
to make level. See Plane, v. t.] (Bot.)
Flattened; made level or even. Diplanar
Diplanar Di*pla"nar, a. [Pref. di- + plane.] (Math.)
Of or pertaining to two planes.
EsplanadeEsplanade Es`pla*nade", n. [F. esplanade, Sp. esplanada,
explanada, cf. It. spianata; fr. Sp. explanar to level, L.
explanare to flatten or spread out. See Explain.]
1. (Fort.)
(a) A clear space between a citadel and the nearest houses
of the town. --Campbell (Mil. Dict. ).
(b) The glacis of the counterscarp, or the slope of the
parapet of the covered way toward the country.
2. (Hort.) A grass plat; a lawn. --Simmonds.
3. Any clear, level space used for public walks or drives;
esp., a terrace by the seaside. ExplanateExplanate Ex"pla*nate, a. [L. explanatus, p. p. of explanare.
See Explain.] (Bot. & Zo["o]l.)
Spreading or extending outwardly in a flat form. ExplanationExplanation Ex`pla*na"tion, n. [L. explanatio: cf. OF.
esplanation.]
1. The act of explaining, expounding, or interpreting; the
act of clearing from obscurity and making intelligible;
as, the explanation of a passage in Scripture, or of a
contract or treaty.
2. That which explains or makes clear; as, a satisfactory
explanation.
3. The meaning attributed to anything by one who explains it;
definition; interpretation; sense.
Different explanations [of the Trinity]. --Bp.
Burnet.
4. A mutual exposition of terms, meaning, or motives, with a
view to adjust a misunderstanding, and reconcile
differences; reconciliation; agreement; as, to come to an
explanation.
Syn: Definition; description; explication; exposition;
interpretation; detail. See Definition. Explanative
Explanative Ex*plan"a*tive, a.
Explanatory.
Explanatoriness
Explanatoriness Ex*plan"a*to*ri*ness, n.
The quality of being explanatory.
Explanatory
Explanatory Ex*plan"a*to*ry, a. [L. explanatorius.]
Serving to explain; containing explanation; as explanatory
notes. --Swift.
Misexplanation
Misexplanation Mis*ex`pla*na"tion, n.
An erroneous explanation.
PlanariaPlanaria Pla*na"ri*a, n.; pl. L. Planari[ae], E. -rias.
[NL. See Planary.] (Zo["o]l.)
Any species of turbellarian worms belonging to Planaria,
and many allied genera. The body is usually flat, thin, and
smooth. Some species, in warm countries, are terrestrial. PlanariaePlanaria Pla*na"ri*a, n.; pl. L. Planari[ae], E. -rias.
[NL. See Planary.] (Zo["o]l.)
Any species of turbellarian worms belonging to Planaria,
and many allied genera. The body is usually flat, thin, and
smooth. Some species, in warm countries, are terrestrial. PlanarianPlanarian Pla*na"ri*an, n. (Zo["o]l.)
One of the Planarida, or Dendroc[oe]la; any turbellarian
worm. -- Pla*na"ri*an, a. PlanarianPlanarian Pla*na"ri*an, n. (Zo["o]l.)
One of the Planarida, or Dendroc[oe]la; any turbellarian
worm. -- Pla*na"ri*an, a. Planarida
Planarida Pla*nar"i*da, n. pl. [NL.] (Zo["o]l.)
A division of Turbellaria; the Dendroc[oe]la.
Planarioid
Planarioid Pla*na"ri*oid, a. [Planaria + -oid.] (Zo["o]l.)
Like the planarians.
PlanaryPlanary Pla"na*ry, a. [L. planarius level. See Plane, a.]
Of or pertaining to a plane. [R.]
Meaning of PLANA from wikipedia
- up
plana in Wiktionary, the free dictionary.
Plana may
refer to:
plural of
Latin word
Planum used in
planetary geology Giovanni Antonio Amedeo Plana (1781–1864)...
-
Planá may
refer to
places in the
Czech Republic:
Planá (České Budějovice District), a muni****lity and
village in the
South Bohemian Region Planá (Tachov...
- Castellón de la
Plana (officially in Valencian: Castelló de la
Plana), or
simply Castellón (Valencian: Castelló), is the
capital city of the
province of...
- The
Plana Cays are a
group of two
small uninhabited islands in the
southern Bahama Islands,
located east of
Acklins Island and west of
Mayaguana Island...
- José
Antonio Plana (born
April 19, 1952) is a Cuban-American
actor and director. He is
known for
playing Betty Suarez's father,
Ignacio Suarez, on the...
-
Selaginella plana,
commonly known as the
Asian spikemoss, is a
lycophyte native to
tropical Asia.
Selaginella plana occurs in
tropical regions of Asia...
-
scientists of his age. The
crater Plana on the Moon is
named in his honor.
Plana was born in Voghera,
Italy to
Antonio Maria Plana and
Giovanna Giacoboni. At...
- 42°31′N 23°26′E / 42.517°N 23.433°E / 42.517; 23.433
Plana (Bulgarian: Плана) is a
mountain range in
western Bulgaria,
bounded by
Sofia Valley to the...
- The pars
plana (also
known as
orbicularis ciliaris ) (Latin: flat portion) is part of the
ciliary body in the uvea (or
vascular tunic, the
middle layer...
-
Velika Plana (Serbian Cyrillic: Велика Плана,
pronounced [ʋêlikaː
plǎːna] ) is a town and muni****lity
located in the
Podunavlje District of Serbia. As...
