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Definition of focus
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of focus is as below...
Focus (n.) 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.
Lern More About Focus
☛ Wiki Definition of Focus
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Amasthenic
::
Amasthenic
(a.)
Uniting
the
chemical
rays of light into one
focus,
as a
certain
kind of lens;
amacratic..
Focusing
::
Focusing
(p. pr. & vb. n.) of Focu.
Collimator
::
Collimator
(n.) A tube
having
a
convex
lens at one end and at the other a small
opening
or slit which is at the
principal
focus of the lens, used for
producing
a beam of
parallel
rays; also, a lens so
used..
Concentrate
::
Concentrate
(v. t.) To bring to, or
direct
toward,
a
common
center;
to unite more
closely;
to
gather
into one body, mass, or
force;
to fix; as, to
concentrate
rays of light into a
focus;
to
concentrate
the
attention..
Aberration
::
Aberration
(n.) The
convergence
to
different
foci, by a lens or
mirror,
of rays of light
emanating
from one and the same
point,
or the
deviation
of such rays from a
single
focus;
called
spherical
aberration,
when due to the
spherical
form of the lens or
mirror,
such form
giving
different
foci for
central
and
marginal
rays; and
chromatic
aberration,
when due to
different
refrangibilities
of the
colored
rays of the
spectrum,
those of each color
having
a
distinct
focus..
Focus
::
Focus (v. t.) To bring to a
focus;
to
focalize;
as, to focus a
camera..
Focus
::
Focus (n.) A
central
point;
a point of
concentration.
Convergent
::
Convergent
(a.)
tending
to one point of
focus;
tending
to
approach
each
other;
converging.
Ellipse
::
Ellipse
(n.) An oval or
oblong
figure,
bounded
by a
regular
curve,
which
corresponds
to an
oblique
projection
of a
circle,
or an
oblique
section
of a cone
through
its
opposite
sides.
The
greatest
diameter
of the
ellipse
is the major axis, and the least
diameter
is the minor axis. See Conic
section,
under
Conic,
and cf.
Focus..
Focus
::
Focus (n.) 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..
Irradiation
::
Irradiation
(n.) The
apparent
enlargement
of a
bright
object
seen upon a dark
ground,
due to the fact that the
portions
of the
retina
around
the image are
stimulated
by the
intense
light;
as when a dark spot on a white
ground
appears
smaller,
or a white spot on a dark
ground
larger,
than it
really
is, esp. when a
little
out of
focus..
Focalization
::
Focalization
(n.) The act of
focalizing
or
bringing
to a
focus,
or the state of being
focalized..
Focused
::
Focused
(imp. & p. p.) of Focu.
Focalize
::
Focalize
(v. t.) To bring to a
focus;
to
focus;
to
concentrate.
Concentre
::
Concentre
(v. t.) To draw or
direct
to a
common
center;
to bring
together
at a focus or
point,
as two or more
lines;
to
concentrate..
Polar
::
Polar (n.) The right line drawn
through
the two
points
of
contact
of the two
tangents
drawn from a given point to a given conic
section.
The given point is
called
the pole of the line. If the given point lies
within
the curve so that the two
tangents
become
imaginary,
there is still a real polar line which does not meet the
curve,
but which
possesses
other
properties
of the
polar.
Thus the focus and
directrix
are pole and
polar.
There are also poles and polar
curves
to
curves
of
higher
degree
th
Myopia
::
Myopia
(n.)
Nearsightedness;
shortsightedness;
a
condition
of the eye in which the rays from
distant
object
are
brought
to a focus
before
they reach the
retina,
and hence form an
indistinct
image;
while the rays from very near
objects
are
normally
converged
so as to
produce
a
distinct
image.
It is
corrected
by the use of a
concave
lens..
Focus
::
Focus (n.) 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.
Directrix
::
Directrix
(n.) A
straight
line so
situated
with
respect
to a conic
section
that the
distance
of any point of the curve from it has a
constant
ratio to the
distance
of the same point from the
focus.
Parabola
::
Parabola
(n.) A kind of
curve;
one of the conic
sections
formed
by the
intersection
of the
surface
of a cone with a plane
parallel
to one of its
sides.
It is a
curve,
any point of which is
equally
distant
from a fixed
point,
called
the
focus,
and a fixed
straight
line,
called
the
directrix.
See
Focus..
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