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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
☛ Wiki Article of Focus
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☛ Google Search for Focus
Image
::
Image (n.) The
figure
or
picture
of any
object
formed
at the focus of a lens or
mirror,
by rays of light from the
several
points
of the
object
symmetrically
refracted
or
reflected
to
corresponding
points
in such
focus;
this may be
received
on a
screen,
a
photographic
plate,
or the
retina
of the eye, and
viewed
directly
by the eye, or with an
eyeglass,
as in the
telescope
and
microscope;
the
likeness
of an
object
formed
by
reflection;
as, to see one's image in a
mirror..
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.
Focus
::
Focus (v. t.) To bring to a
focus;
to
focalize;
as, to focus a
camera..
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..
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 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..
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..
Focalize
::
Focalize
(v. t.) To bring to a
focus;
to
focus;
to
concentrate.
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.
Focus
::
Focus (n.) A
central
point;
a point of
concentration.
Focalization
::
Focalization
(n.) The act of
focalizing
or
bringing
to a
focus,
or the state of being
focalized..
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
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..
Focimeter
::
Focimeter
(n.) An
assisting
instrument
for
focusing
an
object
in or
before
a
camera.
Hypermetropy
::
Hypermetropy
(n.) A
condition
of the eye in
which,
through
shortness
of the
eyeball
or fault of the
refractive
media,
the rays of light come to a focus
behind
the
retina;
farsightedness;
--
called
also
hyperopia.
Cf.
Emmetropia..
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..
Focused
::
Focused
(imp. & p. p.) of Focu.
Corradiate
::
Corradiate
(v. t.) To
converge
to one point or
focus,
as light or
rays..
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