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Definition of lens
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 lens is as below...
Lens (n.) A piece of
glass,
or other
transparent
substance,
ground
with two
opposite
regular
surfaces,
either
both
curved,
or one
curved
and the other
plane,
and
commonly
used,
either
singly
or
combined,
in
optical
instruments,
for
changing
the
direction
of rays of
light,
and thus
magnifying
objects,
or
otherwise
modifying
vision.
In
practice,
the
curved
surfaces
are
usually
spherical,
though
rarely
cylindrical,
or of some other
figure..
Lern More About Lens
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Couching
::
Couching
(n.) The
operation
of
putting
down or
displacing
the
opaque
lens in
cataract.
Glass
::
Glass (v. t.) A hard,
brittle,
translucent,
and
commonly
transparent
substance,
white or
colored,
having
a
conchoidal
fracture,
and made by
fusing
together
sand or
silica
with lime,
potash,
soda, or lead
oxide.
It is used for
window
panes and
mirrors,
for
articles
of table and
culinary
use, for
lenses,
and
various
articles
of
ornament..
Variation
::
Variation
(n.)
Change
of
termination
of
words,
as in
declension,
conjugation,
derivation,
etc..
Microscope
::
Microscope
(n.) An
optical
instrument,
consisting
of a lens, or
combination
of
lenses,
for
making
an
enlarged
image of an
object
which is too
minute
to be
viewed
by the naked eye..
Fall
::
Fall (n.) Lapse or
declension
from
innocence
or
goodness.
Specifically:
The first
apostasy;
the act of our first
parents
in
eating
the
forbidden
fruit;
also, the
apostasy
of the
rebellious
angels..
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..
Smallage
::
Smallage
(n.) A
biennial
umbelliferous
plant
(Apium
graveolens)
native
of the
seacoats
of
Europe
and Asia. When
deprived
of its acrid and even
poisonous
properties
by
cultivation,
it
becomes
celery..
Specular
::
Specular
(a.)
Assisting
sight,
as a lens or the
like..
Graphoscope
::
Graphoscope
(n.) An
optical
instrument
for
magnifying
engravings,
photographs,
etc.,
usually
having
one large lens and two
smaller
ones..
Astigmatism
::
Astigmatism
(n.) A
defect
of the eye or of a lens, in
consequence
of which the rays
derived
from one point are not
brought
to a
single
focal
point,
thus
causing
imperfect
images
or
indistinctness
of
vision..
Theme
::
Theme (n.) A noun or verb, not
modified
by
inflections;
also, that part of a noun or verb which
remains
unchanged
(except
by
euphonic
variations)
in
declension
or
conjugation;
stem..
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..
Sunglow
::
Sunglass
(n.) A
convex
lens of glass for
producing
heat by
converging
the sun's rays into a
focus.
Declension
::
Declension
(n.) Act of
courteously
refusing;
act of
declining;
a
declinature;
refusal;
as, the
declension
of a
nomination..
Broadcloth
::
Broadcloth
(n.) A fine
smooth-faced
woolen
cloth for men's
garments,
usually
of
double
width
(i.e.,
a yard and a
half);
-- so
called
in
distinction
from
woolens
three
quarters
of a yard
wide..
Lens
::
Lens (n.) A piece of
glass,
or other
transparent
substance,
ground
with two
opposite
regular
surfaces,
either
both
curved,
or one
curved
and the other
plane,
and
commonly
used,
either
singly
or
combined,
in
optical
instruments,
for
changing
the
direction
of rays of
light,
and thus
magnifying
objects,
or
otherwise
modifying
vision.
In
practice,
the
curved
surfaces
are
usually
spherical,
though
rarely
cylindrical,
or of some other
figure..
Cataract
::
Cataract
(n.) An
opacity
of the
crystalline
lens, or of its
capsule,
which
prevents
the
passage
of the rays of light and
impairs
or
destroys
the
sight..
Dioptrics
::
Dioptrics
(n.) The
science
of the
refraction
of
light;
that part of
geometrical
optics
which
treats
of the laws of the
refraction
of light in
passing
from one
medium
into
another,
or
through
different
mediums,
as air,
water,
or
glass,
and esp.
through
different
lenses;
--
distinguished
from
catoptrics,
which
refers
to
reflected
light..
Flexion
::
Flexion
(n.)
Syntactical
change
of form of
words,
as by
declension
or
conjugation;
inflection..
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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