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Topic: Light ray

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	Ray (optics) - Wikipedia, the free encyclopedia
		The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.
		The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface.
		A sagittal ray or transverse ray is a skew ray that intersects the pupil at y
	en.wikipedia.org /wiki/Ray_(optics) (662 words)

	Light Waves
		When a ray of light hits the surface of an object, part of the light is reflected.
		If the ray of light is in angle with the surface, then the angle between the incident ray and the normal will be the same angle between the normal and the reflected ray.
		However, when a ray of light goes from a denser medium to a rarer medium, all the light will be reflected if the angle of incidence is greater than the critical angle.
	library.thinkquest.org /10796/ch10/ch10.htm (526 words)

	Light Refraction
		The ray of light which travels through the incident, or first, medium and strikes the boundary, or interface, is called the incident ray.
		The ray of light which travels into the refracted, or second, medium and leaves the interface is called the reflected ray.
		The angle between the incident ray and the normal is called the angle of incidence, or the incident angle.
	id.mind.net /~zona/mstm/physics/light/rayOptics/refraction/refraction1.html (603 words)

	Light Reflection
		The ray of light which strikes the surface is called the incident ray.
		The angle between the reflected ray and the normal is called the angle of reflection, or the reflected angle.
		The reflection of light is often discussed using phrases such as "a ray of light bounces off of a mirror." This is because when a light ray reflects at the surface of a mirror it follows a path similar in behavior to a pool ball bouncing off of a cushion on a pool table.
	id.mind.net /~zona/mstm/physics/light/rayOptics/reflection/reflection1.html (354 words)

	Light Rays (Site not responding. Last check: 2007-10-19)
		When a light ray hits something, part of it usually bounces off (reflection), part of it is absorbed, and if it hits something transparent, part of it continues on its way (refraction).
		Light traveling into a transparent medium is called refraction, and refraction is the topic of sections 29.6 - 29.12 in the text.
		The part of the light ray that is absorbed by a substance is usually converted to heat energy, which is discussed in Unit 3 in the text.
	www.batesville.k12.in.us /Physics/PhyNet/Optics/Reflection/Light_Rays.html (223 words)

	The Recursive Ray Tracing Algorithm
		Ray tracing is a method of generating realistic images by computer, in which the paths of individual rays of light are followed from the viewer to their points of origin.
		Ray casting is a method in which the visible surfaces of objects (those parts of the scene that are immediately visible to the camera) are found by throwing (or casting) rays of light from the viewer into the scene.
		Because the standard ray tracing algorithm actually follows the path of light from the eye of the viewer backward to the light source, it is, in that sense, often referred to as backward ray tracing.
	www.geocities.com /jamisbuck/raytracing.html (4225 words)

	Ray Tracing: Graphics for the Masses
		The two rays will be identical, except for their direction: if the original ray came directly from the light source, then the backwards ray will go directly to the light source; if the original bounced off a table first, the backwards ray will also bounce off the table.
		The final color of the ray (and therefore of the corresponding pixel) is given by the colors of the objects hit by the ray as it travels through the scene.
		If a ray intersects an object, the object's intersection routine returns the distance of the intersection point from the origin of the ray, the normal vector at the point of intersection, and, if texture mapping is being used, a coordinate mapping between the intersection point and the texture image (discussed later in Texture Mapping).
	www.cs.unc.edu /~rademach/xroads-RT/RTarticle.html (3777 words)

	Ray tracing - Wikipedia, the free encyclopedia
		Ray tracing is a general technique from geometrical optics of modelling the path taken by light by following rays of light as they interact with optical surfaces.
		Early ray tracing was always done from the eye, and early researchers such as James Arvo used the term backwards ray tracing to refer to shooting rays from the lights and gathering the results.
		Ray tracing is also used to calculate optical path differences through optical systems, which are used to calculate optical wavefronts, which in turn are used to calculate system diffraction effects such as point spread function, MTF, and Strehl ratio.
	en.wikipedia.org /wiki/Ray_tracing (2364 words)

	Amazon.co.uk: Ray of Light [MINIDISC]: Music: Madonna (Site not responding. Last check: 2007-10-19)
		While Ray of Light is being tagged as Madonna's big leap into electronica, it's important to note two things: first, her music has always had close ties to dance culture, and, second, her collaborator William Orbit is no Chemical Brother.
		Ray Of Light became a monster dance-floor filler that remains as startling as it was on its origanal release.
		Ray of Light takes off like a rocket and soars with Magical ethereal genius that the track is. Candy Perfume Girl is perhaps the only moment of let down a track that at best was not needed.
	www.amazon.co.uk /Ray-Light-MINIDISC-Madonna/dp/B00004WNZ4 (2661 words)

	Chandra :: Field Guide to X-ray Astronomy :: Another Form of Light
		Eventually, X-rays were found to be another form of light.
		In fact they are light, or electromagnetic radiation, to use the technical term.
		Since electrons are the lightest known charged particle, they are most fidgety, so they are responsible for most of the photons produced in the universe.
	chandra.harvard.edu /xray_astro/xrays.html (261 words)

	LIght Ray Therapy - Blue Dragonfly Hair Studio (Site not responding. Last check: 2007-10-19)
		Infrared and red rays are the light frequencies that one receives most abundantly at sunrise and sunset.
		The blue ray is oxygenating and calming, and is used as the leading all natural relief for acne as well as to beat the blues.
		Infrared is the continuation of the red spectrum...and it is a longer wave and therefore has the ability to penetrate deeper.
	www.bluedragonflyhairstudio.com /light_ray_therapy.html (317 words)

	X-ray - Wikipedia, the free encyclopedia
		Hard X-rays overlap the range of "long"-wavelength (lower energy) gamma rays, however the distinction between the two terms depends on the source of the radiation, not its wavelength; X-ray photons are generated by energetic electron processes, gamma rays by transitions within atomic nuclei.
		The light given off during laser stimulation is collected by a photomultiplier tube and the resulting signal is converted into a digital image by computer technology, which gives this process its common name, computed radiography.
		Unlike visible light, which is a relatively stable view of the universe, the X-ray universe is unstable, it features stars being torn apart by fl holes, galactic collisions, and novas, neutron stars that build up layers of plasma that then explode into space.
	en.wikipedia.org /wiki/X-rays (2882 words)

	Spaceflight Now \| Breaking News \| X-ray shout echoing through space recorded by satellite
		Within minutes of the detection, thanks to a sophisticated alert network, many observatories around the world were pointing their instruments at this mysterious source in the sky, named GRB 031203, in the attempt to decipher its nature.
		Since they know precisely at which speed the X-ray light travels in space, the team in Leicester have determined accurately the distance to the dust sheets by measuring the size of the expanding rings.
		The nearest dust sheet is located 2900 light years away and is probably part of the Gum nebula, a bubble of hot gas resulting from many supernova explosions.
	spaceflightnow.com /news/n0401/26xrayecho (1421 words)

	Chandra :: Field Guide to X-ray Astronomy :: Another Form of Light
		This mysterious radiation had the ability to pass through many materials that absorb visible light.
		Light is the by-product of the constant jiggling, vibrating, hurly-burly of all matter.
		When charged particles collide--or undergo sudden changes in their motion--they produce bundles of energy called photons that fly away from the scene of the accident at the speed of light.
	www.chandra.harvard.edu /xray_astro/xrays.html (261 words)

	About As... (Site not responding. Last check: 2007-10-19)
		Nano Light Ray Yuksek Teknoloji Urunleri A.S. is a 50% Turkish (
		Nano Light Ray introduces the benefits of Nanotechnology through providing Nano raw materials and know-how to the industries like automotive, textile, paint, stone as well as competing in markets with finished Nano products.
		Light Ray products are registered and licensed with the China Patent Office, and therefore are worthy of your reliance and long-term commitment.
	www.nanolightray.com /eng (227 words)

	Refraction of Light
		The angle between the light ray and the normal as it enters a medium is called the angle of refraction.
		Ar is the refractive angle between the light ray and the normal to the meduim to medium interface.
		As you approach the critical angle the refracted light approaches 90 or -90 degrees and, at the critical angle, the angle of refractions becomes 90 or -90 and the light is no longer transmitted across the medium/medium interface.
	riker.ps.missouri.edu /rickspage/refract/refraction.html (381 words)

	LedLightRay (Site not responding. Last check: 2007-10-19)
		The Torre Agbar is a colored lighting illuminate skyline that pretend to become one of the 21st century landmark of Barcelona.
		A total of 4,500 L3 RGB lights were installed to illuminate the 32 floors of offices in the Agbar tower.
		The result gives uniform, consistent lighting that is far superior to what has up to now been possible with LED technology.A key feature of the Philips Intuos Multi-die LED technology is 100% color mixing within the secondary optics of the luminaire itself.
	ledlightray.com (1388 words)

	light ray problem
		Suppose the situation is same as (2), but the light ray go from air to water.
		Light can either go through the air next to the glass, or the glass next to the air.
		There is no refraction in the sense that the light ray does not bend, however it is still generally referred to as a refracted ray.
	www.physicsforums.com /showthread.php?t=43359 (361 words)

	Electromagnetic Spectrum - Introduction
		Radiation is energy that travels and spreads out as it goes-- visible light that comes from a lamp in your house or radio waves that come from a radio station are two types of electromagnetic radiation.
		Radio waves, visible light, X-rays, and all the other parts of the electromagnetic spectrum are fundamentally the same thing.
		Electromagnetic radiation can be described in terms of a stream of photons, which are massless particles each traveling in a wave-like pattern and moving at the speed of light.
	imagine.gsfc.nasa.gov /docs/science/know_l1/emspectrum.html (1290 words)

	X-Rays
		As the wavelengths of light decrease, they increase in energy.
		Similarly, when X-ray light shines on us, it goes through our skin, but allows shadows of our bones to be projected onto and captured by film.
		X-ray detectors collect individual X-rays (photons of X-ray light) and things like the number of photons collected, the energy of the photons collected, or how fast the photons are detected, can tell us things about the object that is emitting them.
	imagers.gsfc.nasa.gov /ems/xrays.html (1021 words)

	The Physics Classroom
		When a ray of light strikes a plane mirror, the light ray reflects off the mirror.
		The convention used to express the direction of a light ray is to indicate the angle which the light ray makes with a normal drawn to the surface of the mirror.
		The angle of incidence is the angle between this normal and the incident ray; the angle of reflection is the angle between this normal and the reflected ray.
	www.physicsclassroom.com /mmedia/optics/lr.html (142 words)

	Light Ray Silver (Site not responding. Last check: 2007-10-19)
		Light Ray Silver in the UK are established suppliers of high quality Silver Jewellery, quartz crystal wands, pendulums and energy deflectors, to retailers and therapists worldwide.
		Light Ray Silver are based in the UK.
		Light Ray Silver is a trading name of Light Ray Wands Ltd.
	www.lightraywands.com (112 words)

	NASA - NASA SWIFT Mission Turns On, Sees a Blast Of Bursts
		This image uses colors to represent different energy X-rays: the lowest X-ray energies are shown in red (mostly emission from material rich in iron), the medium energies are in green (mostly silicon-rich material), and the highest energies are in blue.
		Gamma rays are a type of light millions of times more energetic than light human eyes can detect.
		Unlike visible light, gamma rays pass right through telescope mirrors and cannot be reflected onto a detector.
	www.nasa.gov /vision/universe/watchtheskies/swift_first_light.html (885 words)

	Streaming Light Rays
		Now move the light along the Z axis until it is outside the room.
		What about all the light coming through from the open sides of the room?, you may be asking.
		The colour of the light beams is white, previously they were picking up the sun's colour.
	www.petersharpe.com /Tutorial12.htm (410 words)

	11.24.99 - Gamma-ray Bursts Light the Way to the Early Universe
		One of many explanations for gamma ray bursts is a hypernova, an exploding star a hundred times more powerful that a typical exploding star, called a supernova.
		Evidence exists that jets of material are ejected at almost the speed of light during the initial phase of the explosion by a poorly understood process.
		As the fireball expands and cools, the light it emits becomes progressively less energetic; from gamma rays to X-rays, then to ultraviolet and visible light, and finally down to low energy microwave and radio.
	www.gsfc.nasa.gov /topstory/1999/1124gammray_bursts.html (1155 words)

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