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Lettris
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
boggle
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
English dictionary
Main references
Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).
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definitions
light beam (n.)
1.a column of light (as from a beacon)
synonyms
light beam (n.)
beam, beam of light, irradiation, ray, ray of light, shaft, shaft of light
see also
analogical dictionary
onde physique (fr)[Classe]
line[Classe]
ensemble (réunion d'éléments) (fr)[Classe...]
light; visible light; visible radiation[ClasseHyper.]
glisten; glow; shimmer; beam; gleam; shine; glimmer; glitter[ClasseHyper.]
émettre des rayons lumineux (fr)[Classe]
briller d'un éclat très vif (fr)[Classe]
make out; issue; emit[Classe]
rayon (lumière) (fr)[Thème]
(star), (star system)[termes liés]
(light; light source)[termes liés]
physics[Domaine]
RadiatingLight[Domaine]
faire qqch (pour le soleil) (fr)[DomainRegistre]
lumière, rayon lumineux (fr)[DomaineCollocation]
actinic radiation, actinic ray - lighten, lighten up - emit, give off, give out[Hyper.]
illume, illuminate, illumine, light, light up - beam, beam of light, irradiation, light beam, ray, ray of light, shaft, shaft of light - effulgence, gleam, light, radiance, radiancy, refulgence, refulgency, shimmer, shine[Dérivé]
electromagnetic spectrum[Desc]
natural philosophy, physics[Domaine]
bright[Similaire]
rayon lumineux (fr)[Classe]
ensemble de rayons lumineux (fr)[Classe]
physics[Domaine]
RadiatingLight[Domaine]
light, visible light, visible radiation[Hyper.]
irradiate - beam, gleam, glimmer, glisten, glitter, glow, shimmer, shine - ray - beaming, beamy, effulgent, radiant, refulgent[Dérivé]
light beam (n.)
Wikipedia
Wikipedia
Light beam
 |
This article needs additional citations for verification. (April 2010) |
Light beams were used to symbolize the missing towers of the World Trade Center as part of the Tribute in Light.
A light beam or beam of light is a narrow projection of light energy radiating from a source into a beam. Sunlight is a natural example of a light beam when filtered through various mediums (clouds, foliage, windows, etc.). To artificially produce a light beam, a lamp and a parabolic reflector is used in many lighting devices such as spotlights, car headlights, PAR Cans and LED housings. Light from certain types of laser has the smallest possible beam divergence, thus producing the most parallel light beams possible.
Contents |
Visible light beams
From the side, a beam of light is only visible if part of the light is scattered by objects: tiny particles like dust, water droplets (mist, fog, rain), hail, snow, or smoke, or larger objects such as birds. If there are many objects in the light path, then it appears as a continuous beam, but if there are only a few objects, then the light is visible as a few individual bright points. In any case, this scattering of light from a beam, and the resultant visibility of a light beam from the side, is known as the Tyndall effect.
Visibility from the side as side effect
- Flashlight, beam directed by hand
- Headlight, forward beam; the lamp is mounted in a vehicle, or on the forehead of a person, e.g. built into a helmet
- Lighthouse, beam sweeping around horizontally
- Searchlight, beam directed at something
Visibility from the side as purpose
For the purpose of visibility of light beams from the side, sometimes a haze machine or fog machine is used. The difference between the two is that the fog itself is also a visual effect.
Laser beams used for visual effects during musical performance.
- Laser lighting display- Laser beams are often used for visual effects, often in combination with music.
- Searchlights are often used in advertising, for instance by automobile dealers; the beam of light is visible over a large area, and (at least in theory) interested persons can find the dealer or store by following the beam to its source. This also used to be done for movie premieres; the waving searchlight beams are still to be seen as a design element in the logo of the 20th Century Fox movie studio.
Other applications
- Optical communication
- Infrared Data Association (IrDA) standards
- Infrared remote control
- Intrusion alarm#Photo-electric beams
- People counter#Infrared beams
- Fibre optics
- Laser pointer
- Laser sight
- List of applications for lasers
See also
- Ray (optics)
- Pencil beam
- Crepuscular rays
- Laser
- Lighthouse
- Light pillar, atmospheric optical phenomena
