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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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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..
Focal
::
Focal (a.)
Belonging
to,or
concerning,
a
focus;
as, a focal
point..
Focalize
::
Focalize
(v. t.) To bring to a
focus;
to
focus;
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..
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..
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..
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..
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..
Eccentricity
::
Eccentricity
(n.) The ratio of the
distance
between
the
center
and the focus of an
ellipse
or
hyperbola
to its
semi-transverse
axis.
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.
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
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..
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..
Focus
::
Focus (v. t.) To bring to a
focus;
to
focalize;
as, to focus a
camera..
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..
Sunglow
::
Sunglass
(n.) A
convex
lens of glass for
producing
heat by
converging
the sun's rays into a
focus.
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.
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