Lens

Definition of Lens

Pronunciation: lĕnz
n.1.(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.
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
(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.

Related Words

baby blues, banjo eyes, bright eyes, clear eyes, cornea, eye, eyeball, eyelid, goggle eyes, iris, lid, naked eye, nictitating membrane, oculus, optic, optic nerve, orb, organ of vision, peeper, popeyes, pupil, retina, saucer eyes, sclera, starry orbs, unaided eye, visual organ
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