Lens : (noun)
1: a transparent optical device used to converge or diverge
transmitted light and to form images [syn: lense, lens
system]
2: genus of small erect or climbing herbs with pinnate leaves
and small inconspicuous white flowers and small flattened
pods: lentils [syn: Lens, genus Lens]
3: (metaphor) a channel through which something can be seen or
understood; "the writer is the lens through which history
can be seen"
4: biconvex transparent body situated behind the iris in the
eye; it focuses light waves on the retina [syn: crystalline
lens]
5: electronic equipment that uses a magnetic or electric field
in order to focus a beam of electrons [syn: electron lens]
Based on WordNet 2.0
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Lens : \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
diverging meniscus.
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.
Based on Webster's Revised Unabridged Dictionary
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Humor \Hu"mor\, n. [OE. humour, OF. humor, umor, F. humeur, L.
humor, umor, moisture, fluid, fr. humere, umere, to be moist.
See Humid.] [Written also humour.]
1. Moisture, especially, the moisture or fluid of animal
bodies, as the chyle, lymph, etc.; as, the humors of the
eye, etc.
Note: The ancient physicians believed that there were four
humors (the blood, phlegm, yellow bile or choler, and
black bile or melancholy), on the relative proportion
of which the temperament and health depended.
2. (Med.) A vitiated or morbid animal fluid, such as often
causes an eruption on the skin. ``A body full of humors.''
--Sir W. Temple.
3. State of mind, whether habitual or temporary (as formerly
supposed to depend on the character or combination of the
fluids of the body); disposition; temper; mood; as, good
humor; ill humor.
Examine how your humor is inclined, And which the
ruling passion of your mind. --Roscommon.
A prince of a pleasant humor. --Bacon.
I like not the humor of lying. --Shak.
4. pl. Changing and uncertain states of mind; caprices;
freaks; vagaries; whims.
Is my friend all perfection, all virtue and
discretion? Has he not humors to be endured?
--South.
5. That quality of the imagination which gives to ideas an
incongruous or fantastic turn, and tends to excite
laughter or mirth by ludicrous images or representations;
a playful fancy; facetiousness.
For thy sake I admit That a Scot may have humor, I'd
almost said wit. --Goldsmith.
A great deal of excellent humor was expended on the
perplexities of mine host. --W. Irving.
Aqueous humor, Crystalline humor or lens, Vitreous
humor. (Anat.) See Eye.
Out of humor, dissatisfied; displeased; in an unpleasant
frame of mind.
Syn: Wit; satire; pleasantry; temper; disposition; mood;
frame; whim; fancy; caprice. See Wit.
Based on Webster's Revised Unabridged Dictionary
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Lens : Lens: The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the
optic nerve to the brain). The lens was named after the lentil bean because it resembled it in shape and size.
Aside from the lens, the eye has a number of other components. These include the cornea, iris, pupil, retina, macula, optic nerve and vitreous.
The cornea is the clear front window of the eye that transmits and focuses light into the eye.
The iris is the colored part of the eye that helps regulate the amount of light that enters the eye.
The pupil is the dark aperture in the iris that determines how much light is let into the eye.
The retina is the nerve layer that lines the back of the eye, senses light and creates impulses that travel through the optic nerve to the brain.
The macula is a small area in the retina that contains special light-sensitive cells and allows us to see fine details clearly.
The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain.
The vitreous humor is a clear, jelly-like substance that fills the middle of the eye.
Based on Webster's Revised Unabridged Dictionary (1913)
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