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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
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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..
Focuses
::
Focuses
(pl. ) of Focu.
Reticule
::
Reticule
(n..) A
system
of wires or lines in the focus of a
telescope
or other
instrument;
a
reticle.
Latus Rectum
::
Latus
rectum
() The line drawn
through
a focus of a conic
section
parallel
to the
directrix
and
terminated
both ways by the
curve.
It is the
parameter
of the
principal
axis. See
Focus,
and
Parameter..
Diaphragm
::
Diaphragm
(n.) A plate with an
opening,
which is
generally
circular,
used in
instruments
to cut off
marginal
portions
of a beam of
light,
as at the focus of a
telescope..
Focalize
::
Focalize
(v. t.) To bring to a
focus;
to
focus;
to
concentrate.
Amasthenic
::
Amasthenic
(a.)
Uniting
the
chemical
rays of light into one
focus,
as a
certain
kind of lens;
amacratic..
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
Focus
::
Focus (n.) A
central
point;
a point of
concentration.
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..
Micrometer
::
Micrometer
(n.) An
instrument,
used with a
telescope
or
microscope,
for
measuring
minute
distances,
or the
apparent
diameters
of
objects
which
subtend
minute
angles.
The
measurement
given
directly
is that of the image of the
object
formed
at the focus of the
object
glass..
Focus
::
Focus (v. t.) To bring to a
focus;
to
focalize;
as, to focus a
camera..
Hyperbola
::
Hyperbola
(n.) A curve
formed
by a
section
of a cone, when the
cutting
plane makes a
greater
angle with the base than the side of the cone
makes.
It is a plane curve such that the
difference
of the
distances
from any point of it to two fixed
points,
called
foci, is equal to a given
distance.
See
Focus.
If the
cutting
plane be
produced
so as to cut the
opposite
cone,
another
curve will be
formed,
which is also an
hyperbola.
Both
curves
are
regarded
as
branches
of the same
hyperbola.
See
Illust.
o
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..
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..
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.
Emmetropia
::
Emmetropia
(n.) That
refractive
condition
of the eye in which the rays of light are all
brought
accurately
and
without
undue
effort
to a focus upon the
retina;
--
opposed
to
hypermetropia,
myopia,
an
astigmatism..
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.
Focalization
::
Focalization
(n.) The act of
focalizing
or
bringing
to a
focus,
or the state of being
focalized..
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