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light

 [līt]
electromagnetic radiation with a range of wavelength between 390 (violet) and 770 (red) nanometers, capable of stimulating the subjective sensation of sight; sometimes considered to include ultraviolet and infrared radiation as well.
idioretinal light (intrinsic light) the sensation of light in the complete absence of external stimuli.
polarized light light of which the vibrations are made over one plane or in circles or ellipses.
Wood's light ultraviolet radiation from a mercury vapor source, transmitted through a nickel-oxide filter (Wood's filter or glass), which holds back all but a few violet rays and passes ultraviolet rays of wavelength around 365 nm; used in diagnosis of fungal infections of the scalp and erythrasma, and to reveal the presence of porphyrins and fluorescent minerals.

light

(līt),
1. That portion of electromagnetic radiation (for example, 390-770 nm) to which the retina is sensitive (wavelength range, 380-780 nm).
See also: lamp.
See also: lamp.
2. Describing a solid element, having a low density.
See also: lamp.
3. Having a subnormal mass.
See also: lamp.
[A.S. leōht]

light

photophobia.

light

(līt) electromagnetic radiation with a range of wavelength between 3900 (violet) and 7700 (red) angstroms, capable of stimulating the subjective sensation of sight; sometimes considered to include ultraviolet and infrared radiation as well.
idioretinal light  the sensation of light in the complete absence of external stimuli.
intrinsic light  the dim light always present in the visual field.
polarized light  light of which the vibrations are made over one plane or in circles or ellipses.
Wood's light  ultraviolet radiation from a mercury vapor source, transmitted through a nickel-oxide filter (Wood's filter, or glass), which holds back all but a few violet rays and passes ultraviolet wavelengths of about 365 nm.

light

Etymology: AS, leoht
1 electromagnetic radiation of the wavelength and frequency that stimulate visual receptor cells in the retina to produce nerve impulses that are perceived as vision.
2 electromagnetic radiation with wavelengths shorter than ultraviolet light and longer than infrared light, the range of visible light generally in the range of 400 to 800 nm.

light

Electromagnetic radiation, usually understood to be in the range of visible light–ie, 390 to 770 nm. See Curing light, Ultraviolet light.

light

(līt)
That portion of electromagnetic radiation to which the retina is sensitive.
See also: lamp
[A.S. leōht]

light

that part of the ELECTROMAGNETIC SPECTRUM which is visible to the human eye between about 400 nm (blue) and 770 nm (red).

light

visible electromagnetic radiation

light

Electromagnetic vibration capable of stimulating the receptors of the retina and of producing a visual sensation. The radiations that give rise to the sensation of vision are comprised within the wavelength band 380-780 nm. This band is called the visible spectrum or visible light. The borders of this band are not precise but beyond these radiations the visual efficacy of any wavelength becomes very low indeed (less than 10−25). See coherent sources; infrared; absorptive lens; spectroscope; electromagnetic spectrum; visible spectrum; Table C4; quantum theory; wave theory; ultraviolet; wavelength.
achromatic light See achromatic light stimulus.
light adaptation See light adaptation.
artificial light Any light other than natural light.
beam of light A collection of pencils arising from an extended source or object. Syn. bundle of light. See pencil of light.
bundle of light See beam of light.
light chaos See idioretinal light.
cold light Any visible light emitted by a process other than incandescence such as lasers, glow worms, certain chemical reactions, etc. Cold light is free of infrared.
compound light Light composed of more than one wavelength.
diffuse light Light coming from an extended source and having no predominant directional component. Illumination is thus relatively uniform with a minimum of shadows. See diffusion; extended source.
fluorescent light Light emitted by fluorescence as in a fluorescent lamp. Electricity excites a gas that produces ultraviolet light, which in turn causes a phosphor coating on the inner surface of the fluorescent tube to fluoresce and emit visible light. Examples: mercury vapour lamp, neon and argon lamps, sodium vapour lamp, xenon flash lamp.
frequency of light See hertz; electromagnetic spectrum; wavelength.
idioretinal light A visual sensation occurring in total darkness that is attributed to spontaneous nervous impulses in the neurons of the visual pathway. Syn. intrinsic light; light chaos.
incandescent light Light emitted by incandescence as in an incandescent lamp. An electrical current passes through a thin filament (e.g. tungsten) enclosed in a sealed oxygen-free glass bulb. The filament is heated and photons are released. See filament lamp; halogen lamp.
infrared light See infrared.
intrinsic light See idioretinal light.
monochromatic light Light consisting of a single wavelength or, more usually, of a narrow band of wavelengths (a few nanometres).
natural light Light received from the sun and the sky.
pencil of light A narrow cone of light rays coming from a point source or from any one point on a broad source after passing through a limiting aperture. A pencil of light may be convergent, divergent or parallel. The ray passing through the centre of the aperture is the chief ray. Syn. homocentric bundle of rays; homocentric pencil of rays. See beam of light.
polarized light Ordinary light is composed of transverse wave motions uniform in all directions in a plane perpendicular to its direction of propagation. Polarized light is composed of transverse wave motions in only one direction, called the plane of vibration. Polarized light can be obtained by using a polarizer (e.g. tourmaline crystals, polarizing material such as Polaroid, Nicol prism, etc.). See analyser; angle of polarization; dichroic crystal; polarizing lens; polarizer; Wollaston prism; vectogram.
quantity of light Product of luminous flux and its duration. Unit: lumen-second. See lumen.
light reflex See corneal reflex; pupil light reflex.
solar light Light from the sun or having identical properties as the sun. See eclipse blindness; white light.
light source Any source of visible radiant energy such as natural light (e.g. daylight, moonlight, sunlight) or artificial light (e.g. a candle flame, an incandescent lamp, a discharge lamp, a fluorescent lamp). See coherent sources; CIE standard illuminants.
speed of light The currently accepted figure is 299 792.5 km/s (in a vacuum). This velocity decreases, differentially with wavelength, when the radiation enters a medium. See index of refraction; electromagnetic spectrum.
light stop See diaphragm.
stray light Light reflected or passing through an optical system but not involved in the formation of the image such as that reflected by the surfaces of a correcting lens. Syn. parasitic light. See ghost image.
light threshold See light absolute threshold.
ultraviolet light See ultraviolet; Wood's light.
visible light See light; visible spectrum.
white light Light perceived without any attribute of hue. Any light produced by a source having an equal energy spectrum will appear white after the eye is adapted. Some of the CIE illuminants are often used as a source of white light, e.g. B, C and D. Sunlight is a source of white light. See chromaticity diagram; equal energy spectrum.
Wood's light Ultraviolet light near the visible spectrum which, when used with certain dyes such as fluorescein, causes fluorescence. It is produced by a special type of glass (called Wood's glass or Wood's filter), which contains nickel oxide and transmits ultraviolet radiations near the visible spectrum. It is used to detect corneal abrasions and to evaluate the fit of hard contact lenses. It is available in a slit-lamp or in a Burton lamp. See fluorescein; fluorescence; Burton lamp.

light

(līt)
That portion of electromagnetic radiation to which the retina is sensitive.
See also: lamp
[A.S. leōht]

light,

n 1. the electromagnetic radiation of the wavelength and frequency that stimulate visual receptor cells in the retina to produce nerve impulses that are perceived as vision.
2. visible light ranges from 400 to 800 nm.
light box,
light, chemiluminescent,
n light produced by the conversion of chemical energy into light energy.
light fog,
light leaks,
light, operating,
n a light with a strong beam that may be directed for concentrated illumination of a part being operated on.
light pen,
n a pointerlike device available with some computer terminals. A light pen selects data displayed on the screen by being pointed at any desired item.
light touch,

light

electromagnetic radiation with a range of wavelength between about 390 nm (violet) and 770 nm (red), capable of stimulating the subjective sensation of sight; sometimes considered to include ultraviolet and infrared radiation as well.

light beam diaphragm
adjustable lead shutters at the aperture of an x-ray tube. Usually includes a light bulb which delimits the area covered by the beam at the cassette level.
light cattle
store class cattle off range and destined for movement onto irrigated pasture or into feedlot for fattening.
light-dark cycles
an important environmental factor in proper housing of laboratory animals for optimal health and reproductive cycling. Most species do well on a 12:12 light-dark cycle but in rabbits more light for females and less for males is recommended.
polarized light
light of which the vibrations are made over one plane or in circles or ellipses.
light sensitization
light sheep
sheep light in condition off subsistence range and destined to go to irrigated pasture or into a feedlot for fattening.
light stimulus
Wood's light
see wood's light.
References in periodicals archive ?
Greenberg, Toward a psychophysically-based light reflection model for image synthesis, in Computer Graphics, Annual Conference Series, ACM SIGGRAPH (2000) pp.
The system is organized into three subsections, or stages, dealing with the local light reflection model, the global light transport simulation, and the image display.
Multi-coating on all the optical elements further ensures maximum light transmission with lowest level of light reflection and flare to produce bright, high clarity pictures and video.
4 KitKat and includes an 8-inch 1920 x 1200 Full HD display with IPS and Zero Air Gap technologies to reduce light reflection offering higher contrast with brighter, crisper images and better readability under the sunlight.
An adhesive with the ability to be polymerized under light reflection was produced as well.
He said that they were very excited and moved on to the other 'candidates' from observation and later that night we found yet another light reflection of the quasar.
Desso has introduced a new carpet collection to the Middle East region - the Desso Light Reflection Master, which can increase the brightness of a room by up to 14% , and can cut lighting bills by up to 10%, the company claims.
Desso Light Reflection Master can increase the brightness of a room by up to 14 per cent , and can cut lighting bills by up to 10 per cent, thereby offering clients both savings in energy and costs.
These properties translate into various combinations of transmission and diffusion in order to meet end users' light guidance and light reflection needs.
The hybrid reflection hologram can exhibit display parameters including the multiple colors, solidity, and color stability of white light reflection holograms, the diffractive color shifting of a white light transmission hologram, three dimensional imaging and a wide variety of dynamic changes.
technology minimizes light reflection to reduce ghost and flare, while
This helps to leave the skin smooth and improves light reflection off the surface, which gives a healthy glow and a good base for moisturiser.