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