Laser Reflective Mirror If you're in a mirror-room, and turn a laser on and off, why doesn't the light keep on bouncing forever?
Suppose is a 100% reflective room, and the laser source is hidden, so there's nothing but mirrors, in a vacuum. Since the photons aren't getting absorbed, why wouldn't the laser just continue going forever?
I realize it's an assumption but I'm leaning for the skeptic side. Don't hypotheses start with reasonable assumptions? I would do those experiment at home except I can't afford a particle accelerator at the moment... Thanks for your answers... It's all very interesting.
basic principles of wave propigation. a body in motion tends to stay in motion. if what you're saying is the vacuum is deviod of all matter, including subatomic particles, the wave would continue forever, with one exception. if the beam reflecting around the room collided with itself (say it caught itself in a corner), it would cause sufficient refraction to scatter the beam eventually. photons expend no energy to travel, so the room would stay lit up forever. and man, that would have to be some badass 100% reflective material! ;->
An excellent aid for teaching the basics of geomentry including symmetry, line reflections, transformations and congruence. Purple translucent acrylic plastic measures 6" x 4".
Description Mirror Reflective Screen Protector for your privacy - no one beside you can view your screenJapanese High-Quality Material, 99% Transparency, No BubblesAgainst scratching, scraping & abrasion Removable without leaving residuary mark Resistance to erosion & fingerprintAnti-Reflective, Non-corrosiveCompatible with model: NOKIA N80Total Weight: 13gPackage Includes 1 x screen protector 1 x cloth 
Description Mirror Reflective Screen Protector for your privacy - no one beside you can view your screenJapanese High-Quality Material, 99% Transparency, No BubblesAgainst scratching, scraping & abrasion Removable without leaving residuary mark Resistance to erosion & fingerprintAnti-Reflective, Non-corrosiveCompatible with model: Motorola L7Total Weight: 13gPackage Includes 1 x screen protector 1 x cloth 
"Weve got the latest, hottest and most authentic looking logos from Stickerpoint Pressure-sensitive vinyl logos are pre-spaced and ready for mounting on machine, trailer, shop or any place you wish to declare your allegiance Laser-cut ss"
DescriptionMirror Reflective Screen Protector for your privacy - no one beside you can view your screenJapanese High-Quality Material, 99% Transparency, No BubblesAgainst scratching, scraping & abrasionRemovable without leaving residuary markResistance to erosion & fingerprintAnti-Reflective, Non-corrosiveCompatible with model: Motorola V3Total Weight: 13gPackage Includes 1 x outside screen protector1 x inside screen protector1 x cloth
Feature: Act as a mirror use for makeup!99% transparencyNo bubbles & WashableAnti-glareNON-StreakingEasy DIYProtect screen from scratching and dirtNon-corrosive, silicon base adhesion removable, easy to be replacedCompatible with NOKIA N80A piece of cloth available for cleaning screenWeight: 14gMobile phone NOT INCLUDED!!! 
Feature: Act as a mirror use for makeup!99% transparencyNo bubbles & WashableAnti-glareNON-StreakingEasy DIYProtect screen from scratching and dirtNon-corrosive, silicon base adhesion removable, easy to be replacedCompatible with O2 ATOMA piece of cloth available for cleaning screenWeight: 14gMOBILE PHONE not included!!! 
Description Mirror Reflective Screen Protector for your privacy - no one beside you can view your screenJapanese High-Quality Material, 99% Transparency, No BubblesAgainst scratching, scraping & abrasion Removable without leaving residuary mark Resistance to erosion & fingerprintAnti-Reflective, Non-corrosiveCompatible with model: Motorola L7Total Weight: 13gPackage Includes 1 x screen protector 1 x cloth 
Description Mirror Reflective Screen Protector for your privacy - no one beside you can view your screenJapanese High-Quality Material, 99% Transparency, No BubblesAgainst scratching, scraping & abrasion Removable without leaving residuary mark Resistance to erosion & fingerprintAnti-Reflective, Non-corrosiveCompatible with model: Motorola L7Total Weight: 13gPackage Includes 1 x screen protector 1 x cloth 
Feature:NOKIA N70 Screen Protector act as a mirror use for makeup!99% transparency of the Screen ProtectorNo bubbles & WashableAnti-glare NON-StreakingEasy DIYN70 Screen Protector protect screen from scratching and dirtNon-corrosive, silicon base adhesion removable, easy to be replacedCompatible with NOKIA N70A piece of cloth available for cleaning screenWeight: 14gMobile phone NOT INCLUDED!!!!
Klara Modern Lamp - Reflective. The Klara Modern Floor Lamp makes a great addition to any home. Sophisticated and glamorous, this accent piece has a transparent mirror shade that enables you to see its sputnik shape and a chrome metal base for a sleek look. It is topped with a cylindrical mirrored shade with an unsual transparent finish. Twelve half-chromed bulbs complete this streamlined look. Unexpected details elevate this unique design to the realm of the extraordinary. Combing a sleek, sophisticated look with a modern sputnik design, the Klara Sputnik Floor Lamp makes a beautiful addition to home of all styles.
Asian obelisk features a frame of hand bent wire, giving it a naturalistic look of tender twigs. Each side of the pillar has a mirror panel to cast a reflection of the surrounding flowers.Product Dimensions - 5 1/4L x 5 1/4W x 28H
Asian obelisk features a frame of hand bent wire giving it a naturalistic, human touch. Each side has a glass mirror to cast a reflection of surrounding flowers. 5.25" dia x 28 overall height Size/Dimensions: Not Available Type: Home Accents Color/Finish: Multi-Color
Description:Japanese High-Quality Material, 99% Transparency, No BubblesAgainst scratching, scraping & abrasion Removable without leaving residuary mark Resistance to erosion & fingerprintAnti-Reflective, Non-corrosiveCompatible with model: Motorola L7Total Weight: 13gPackage Includes 1 x screen protector 1 x cloth 
In Store Used USED OMNISISTEM DIAMOND CUT LASER REFRACTION MIRROR 042112
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KHET education activity. Learn how light reflects from a mirror using KHET: the laser game
Laser Cutting: The Fundamentals
When we think of lasers, we may conjure up something seen in the movies. Lasers, however, can be found in real-world industry, making slicing and transforming objects much easier in industry. In laser material processing, a laser will strike a target and alterations to that object will occur, such as through absorption of photons, which are particles of light emitted from the laser. These particles will be changed into heat energy.
How Lasers Actually Work
Lasers are the devices that control how highly stimulated atoms emit photons to create a stream of light. There are only three things that can occur when a laser connects with a material. The laser light stream will either be reflected, sent, or it will be absorbed into the object. Sometimes two or three of these occurrences, such as transmission and absorption, may happen at the same time. The beam will be a certain wavelength and a certain color as well as tight and concentrated, not like beams of light normally found in everyday life. If the majority of the beam is absorbed into an object, which is most often the case in laser material processing, the main traits that have to be taken into consideration are the average strength the laser light has, its intensity on the object it hits, and its wavelength. Intensity on a basic level is the brightness of the laser beam. The wavelength is the sequence of waves the photons create. Think of a moving water wave, the photons are fluctuating in the same type of wave. The average power of a laser beam is measured in watts (W). Lasers all have an active medium that absorbs energy. The medium can be composed of either a solid crystal-like material, fluid, gas (such as in a CO2 laser), or a diode, and holds the atoms absorbing the energy. A laser also has to have a method to make the atoms become excited. This might be a light source, for example.
The optical resonator is a set of mirrors in the laser system. One of the abilities of a laser is to energize the atoms to get them in an excited state. This is done by pumping up what is referred to as a lasing medium inside the laser. At each extreme of the lasing medium is a mirror. Photons reflect off of both of the mirrors and energize other electrons to discharge even more photons. The mirror at one end lets some light through, which is the laser beam. Getting the atoms excited takes getting their matching electrons at a high level of energy. The energized electrons that initially soaked in energy to get excited can now emit energy as light energy, or a stream of photons.
Lasers and Different Classifications
Lasers are rated according to the traits of average power, wavelength, and intensity. This implies they are either solid-state, fluid, gaseous, or semi conductor lasers. Solid-state are lasers with material that is optically clear and the engaged medium is solid. Fluid, or dye lasers have a environment that is liquid and they can work with pulsing or continuous wavelengths. Gas of gas. Examples of gas lasers are CO2 lasers and neon signs seen in shop displays. And the fourth group is semi conductor or diode lasers that are the most common type of laser.
Laser Cutting
Using CO2 lasers as an example, carbon dioxide atoms in gaseous form become excited at a low pressure between two mirrors. One of the mirrors allows a little bit of the light stream escape. They produce a huge amount of heat. The light output is at the end of the infrared spectrum. Having a beam of high quality is important, especially in cutting. Lasers cut by using the light beam the laser makes. The beam starts by melting what is in front of it or oftentimes through vaporization. Cutting occurs when the beam has cut through the object. There are various types of lasers designed to slice various types of materials. CO2 lasers have high capacities for absorption, and are commonly used in the cutting of plastics, wood, stainless steel, carbon steel, aluminum, and other metals such as titanium. CO2 lasers have other materials in them besides carbon dioxide; they have a mixture of gases such as helium (He) and nitrogen (N2). Nitrogen will slice up to ½ inch thick stainless steel in addition to aluminum. Oxygen will cut carbon steel. Laser cutting advantages include no wear and tear on machinery, are faster than using other methods of cutting, and can cut through thicker materials.
Lasers have uses ranging from communications to uses in the field of medicine. They have revolutionized surgery and cutting in industry. It is interesting to see what will happen in the future with laser cutting abilities.
About the Author
Marc Anderes is the VP of Operations of Maloya Laser which specializes in Metal Manufacturing and Laser Cutting with advanced laser technologies, for aerospace, scientific, transportation, medical and machinery requirements.
Thanks for your answers... It's all very interesting.
