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Optics is the study of the behavior and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behavior of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Most optical phenomena can be accounted for using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that cannot be accounted for in geometric optics. Historically, the ray-based model of light was developed first, followed by the wave model of light. Progress in electromagnetic theory in the 19th century led to the discovery that light waves were in fact electromagnetic radiation. Some phenomena depend on the fact that light has both wave-like and particle-like properties. Explanation of these effects requires quantum mechanics. When considering light's particle-like properties, the light is modeled as a collection of particles called "photons". Quantum optics deals with the application of quantum mechanics to optical systems. Optical science is relevant to and studied in many related disciplines including astronomy, various engineering fields, photography, and medicine (particularly ophthalmology and optometry). Practical applications of optics are found in a variety of technologies and everyday objects, including mirrors, lenses, telescopes, microscopes, lasers, and fiber optics. From Wikipedia under the
GNU Free Documentation License In optics: Is it possible to translate a focal length of a 35mm lens to a magnification value? Q. For example, if I have a 400mm focal length lens for a 35mm camera, can that translate to a magnification level? Most people that aren't familiar with optics or photography ask me what kind of lens I have... when I tell them it's a 400mm they just kind of look back with a blank stare. I think they would understand better if I could them it was a 10x or 12x or something like that. I'm a entry level independant photographer and I like talking to people about my work to generate possible intrest in doing work for them, and I just want to be able to put things in laymen's terms for them. Asked by CJP - Fri Sep 22 10:41:58 2006 - - 6 Answers - 0 Comments A. Your eye sees at close to a 50mm lens. So a 100 is 2X a 400 is 8X. Answered by Nelson_DeVon - Fri Sep 22 10:50:51 2006 How do fiber optics work? Q. I know fiber optics are made of glass, but how do they get them to bend in a cable? it is just a property of glass to be flexible when its in really thin rods or what? Asked by Daniel C - Thu Feb 15 06:08:20 2007 - - 2 Answers - 0 Comments A. In practical fibers, the cladding is usually coated with a tough resin buffer layer, which may be further surrounded by a jacket layer, usually plastic. These layers add strength to the fiber but do not contribute to its optical wave guide properties. For indoor applications, the jacketed fiber is generally enclosed, with a bundle of flexible fibrous polymer strength members like Aramid (e.g. Twaron or Kevlar), in a lightweight plastic cover to form a simple cable. Each end of the cable may be terminated with a specialized optical fiber connector to allow it to be easily connected and disconnected from transmitting and receiving equipment. For use in more strenuous environments, a much more robust cable construction is required. In loose- [cont.] Answered by jdsheth2004 - Thu Feb 15 12:20:28 2007 A list of Fibre Optics broadband providers in British Columbia/Burnaby area?
Q. What are some of the Fibre Optics providers in the Burnaby area? How much do they sell for per month? Max download/upload speed? Asked by stivi619 - Sun Nov 2 15:12:53 2008 - - 1 Answers - 0 Comments A. I get a chuckle out of these questions! You got a pc! You know how to search right? Answered by blamay22000 - Sun Nov 2 15:17:14 2008 From Yahoo Answer Search: "Optics"
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New York State Photonics Industry Association
Microtrac, Inc.
Apollo Instruments