Definition of Fresnel lens. Meaning of Fresnel lens. Synonyms of Fresnel lens
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Definition of Fresnel lens
Fresnel lensLens Lens (l[e^]nz), n.; pl. Lenses (-[e^]z). [L. lens a
lentil. So named from the resemblance in shape of a double
convex lens to the seed of a lentil. Cf. Lentil.] (Opt.)
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. Lenses
Note: Of spherical lenses, there are six varieties, as shown
in section in the figures herewith given: viz., a
plano-concave; b double-concave; c plano-convex; d
double-convex; e converging concavo-convex, or
converging meniscus; f diverging concavo-convex, or
Crossed lens (Opt.), a double-convex lens with one radius
equal to six times the other.
Crystalline lens. (Anat.) See Eye.
Fresnel lens (Opt.), a compound lens formed by placing
around a central convex lens rings of glass so curved as
to have the same focus; used, especially in lighthouses,
for concentrating light in a particular direction; -- so
called from the inventor.
Multiplying lens or glass (Opt.), a lens one side of
which is plane and the other convex, but made up of a
number of plane faces inclined to one another, each of
which presents a separate image of the object viewed
through it, so that the object is, as it were, multiplied.
Polyzonal lens. See Polyzonal. Fresnel lensFresnel lens Fres`nel" lens" [See Fresnel lamp.] (Optics)
See under Lens.
Meaning of Fresnel lens from wikipedia
- A Fresnel lens
(/ˈfreɪn-, ˈfrɛn.ɛl, -əl/ FRAYN-, FREN-el, -əl, /freɪˈnɛl/ fray-NEL or /ˈfrɛznəl/ FREZ-nəl) is a type of composite compact lens
–Arago laws Fresnel equations Fresnel imager Fresnel integral Fresnel lantern Fresnel lens Fresnel number Fresnel rhomb Fresnel
- Hyper-radial or hyperradiant Fresnel lenses
are Fresnel lenses
used in lighthouses. They are larger
than "first-order" lenses
a focal length
- A Fresnel lantern
(pronounced frəˈnɛl or fruh-nel) is a common lantern
used in theatre, which employs
a Fresnel lens
to wash light
over an area of the...
- Unlike lenses
or curved mirrors
however, zone plates
use diffraction instead
or reflection. Based
by Augustin-Jean Fresnel
- the system. The Improved Fresnel Lens Optical Landing
System, IFLOLS, uses a fiber optic
"source" light, projected through lenses
a sharper, crisper...
, such that the combination
acts as a single lens
but is much thinner. This arrangement
as a Fresnel lens
. The magnifying...
- the choice
sources, mountings, reflector
design, the use of Fresnel lenses
, and in rotation
and shuttering systems providing lighthouses
- science fiction author Gregory Benford calculated
that a concave rotating Fresnel lens
across, yet only a few millimeters
. A Fresnel lens
has its optical surface broken
up into narrow
to be much thinner
than conventional lenses
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