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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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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..
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..
Focus
::
Focus (n.) A
central
point;
a point of
concentration.
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
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..
Focal
::
Focal (a.)
Belonging
to,or
concerning,
a
focus;
as, a focal
point..
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.
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..
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 (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..
Focused
::
Focused
(imp. & p. p.) of Focu.
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..
Reticule
::
Reticule
(n..) A
system
of wires or lines in the focus of a
telescope
or other
instrument;
a
reticle.
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..
Corradiate
::
Corradiate
(v. t.) To
converge
to one point or
focus,
as light or
rays..
Focuses
::
Focuses
(pl. ) of Focu.
Focus
::
Focus (v. t.) To bring to a
focus;
to
focalize;
as, to focus a
camera..
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.
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..
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