What is an optical imaging sytem?
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An optical imaging system is any system that can be used to record an image, this can be a camera, video etc.
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focal length = infinity\ncurvature  = 0
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Focal length.\nThe distance from the lens to a point at which the light going through the lens will converge into a sigle point.\n\nAfter the light enters a lens straight on, the light is bent, causing the light to focus toward a signle point. After that point the image is turned upside down.
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Infrared\nFrom Wikipedia, the free encyclopedia\nJump to: navigation, search\nImage of a small dog taken in mid-infrared ("thermal") light (false color)\nEnlarge\nImage of a small dog taken in mid-infrared ("thermal") light (false color)\n\nInfrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of microwave radiation. The name means "below red" (from the Latin infra, "below"), red being the color of visible light of longest wavelength. Infrared radiation spans three orders of magnitude and has wavelengths between approximately 750 nm and 1 mm.
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gamma camera   \nDefinition:\nA camera used in scintillation recording to make a visible record of the distribution and relative concentration of radioactive tracer elements in a sample that is undergoing scanning.A gamma camera is a complex device consisting of one or more detectors mounted on a gantry. It is connected to an acquisition system for operating the camera and for storing the images.\n\nThe system accumulates counts of gamma photons that are absorbed by a crystal in the camera, usually a large flat crystal of sodium iodide with thallium doping in a light-sealed housing. The crystal scintillates in response to incident gamma radiation: when the energy of an absorbed gamma photon is released, a faint flash of light is produced. This phenomenon is similar to the photoelectric effect. Photomultiplier tubes (PMT) behind the crystal detect the fluorescent flashes and a computer sums the fluorescent counts. The computer in turn constructs and displays a two dimensional image of the relative spatial count density on a monitor. This image then reflects the distribution and relative concentration of radioactive tracer elements present in the organs and tissues imaged.
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In electronics, an opto-isolator (or optical isolator, optocoupler) is a device that uses a short optical transmission path to transfer a signal between elements of a circuit, typically a transmitter and a receiver, while keeping them electrically isolated — since the signal goes from an electrical signal to an optical signal back to an electrical signal, electrical contact along the path is broken.\nA common implementation involves an LED and a light sensor, separated so that light may travel across a barrier but electrical current may not.
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What's not clear is whether the image is a virtual or real one.\n\nFirst, consider a quick graphical, geometrical ray trace of a focusing \nmirror (let's assume it's spherical so that the analysis is simple).  I \nusually do this by drawing the reflector and locating its center of \ncurvature and focal point (which is just half the distance from the middle \nof the sphere to the center of curvature).  To look at image formation, I \ndraw a large number "1" where the object should be -- in this case, \noutside the focal point.  I then draw two rays from the top of the "1" -- \none parallel to the line from the center of the sphere throught the radius \nof curvature and one through the radius of curvature.  The first ray must, \nafter reflection, go through the focal point (because it acts as a \nparallel ray from infinity, which are all focused at the focal distance \nfrom any optic).  The second must just come back upon itself, because it \nis perpendicular to the reflector surface.  The intersection of the two \nrays is where the head of the image "1" is located.  In this case, it's \noutside the focal point.  I then do the same thing from the bottom of \nthe "1", and then draw the orientation of the imaged "1"...  It's clearly \ninverted and reduced in size and more than 1 focal length away from the \nmirror.  This is clearly the real image you referred to in your question.  \n\nWhere's the virtual image?  It's not there!  What you're observing is the \nreal image.\n\nTo understand this, consider what a virtual image is and how it's formed \nby an example.  A virtual image does NOT result from the convergence of \nray bundles at any real point in space... A virtual image is observed when \na situation arises rays from a single point appear to emerge from a point \nin space, but which doesn't correspond to any real point.  A good way to \nsee this is to turn the spoon around and look at the convex surface.  You \nsee yourself right side up!  If you do the ray trace using the method I \noutline above, you find an apparent convergence of rays behind the mirror \nwhich produces an upright image, which is just what you see in this case.  \nBut, since the spoon is silver, it's pretty apparent that there can't be \nany rays actually focused behind it -- so it's a virtual image.\n\nAn interesting thing occurs, however, when you flip the spoon back to the \noriginal configuration and move the object inside the focal point.  The \nimage you see is no longer inverted! And it's big!  If you do the ray \ntrace you find that the convergence of the rays which form the image is \nnow in back of the spoon, so that the image has shifted to an upright \nvirtual image which is magnified.  Try it with one of your spoons -- it \nreally works!\n\nAnd even more interestingly, if the object were placed exactly at the \nfocal point, all hell would break loose and what you would see would be a \ngiant blob filling the spoon that looks like nothing but a big source of \nlight.  In this case, there is neither a virtual nor a real image formed \nand the mirror/spoon is acting like a collimator -- turning all rays from \nthe object into parallel light streaming to infinity (roughly).\n\nI hope this helps!
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BLUE-RAY  The new technology
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EXIF Viewer is a simple image viewer application for photos taken with digital cameras. It's capable of reading EXIF information embedded in photos as well as little thumbnail.\n\nThis is what you want. Just Google for "EXIF Viewer" if you want a different program though.
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More complex radar systems, like those used at airports, allow radio waves to be imaged on a computer screen. They send out a beam of radio waves (like a flashlight sends out light), collect the waves that reflect of off distant objects, and reconstruct the wave pattern into an image (like the eye does with light). The result is displayed for the operator to see.
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a regular camera lens focuses in light sensitive diodes, then the diodes changes electricity into digital elericity which is  0s and 1s which can be a file on a computer, and then those can focus on the computer into a folder
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Photography is the process of making pictures by means of the action of light. Light patterns reflected or emitted from objects are recorded onto a sensitive medium or storage chip through a timed exposure. The process is done through mechanical, chemical or digital devices known as cameras.\nLens and mounting of a large format camera\nEnlarge\nLens and mounting of a large format camera\nWikibooks\nWikibooks has more about this subject:\nPhotography\n\nThe word comes from the Greek words φως phos ("light"), and γραφις graphis ("stylus", "paintbrush") or γραφη graphê, together meaning "drawing with light" or "representation by means of lines" or "drawing." Traditionally the product of photography has been called a photograph. The term photo is an abbreviation, many people also call them pictures. In digital photography, the term image has begun to replace photograph. (The term image is traditional in geometric optics.)\n\n\n\nUses of photography\n\nPhotography can be classified under imaging technology and has gained the interest of scientists and artists from its inception. Scientists have used its capacity to make accurate recordings, such as Eadweard Muybridge in his study of human and animal locomotion (1887). Artists have been equally interested by this aspect but have also tried to explore other avenues than the photo-mechanical representation of reality, such as the pictorialist movement. Military, police and security forces use photography for surveillance, recognition and data storage. Photography is used to preserve memories of favourites and as a source of entertainment.\n\n\nHistory of photography\nNicéphore Niépce's earliest surviving photograph, c. 1826\nEnlarge\nNicéphore Niépce's earliest surviving photograph, c. 1826\nSketch of the same scene\nEnlarge\nSketch of the same scene\n[edit]\n\nInvention\n\n    Main article: History of the camera\n\n[edit]\n\nChemical photography\n\nFor centuries images have been projected onto surfaces. The camera obscura and the camera lucida were used by artists to trace scenes as early as the 16th century. These early cameras did not fix an image in time; they only projected what passed through an opening in the wall of a darkened room onto a surface. In effect, the entire room was turned into a large pinhole camera. Indeed, the phrase camera obscura literally means "darkened room," and it is after these darkened rooms that all modern cameras have been named.\n\nThe first photograph is considered to be an image produced in 1826 by the French inventor Nicéphore Niépce on a polished pewter plate covered with a petroleum derivative called bitumen of Judea. It was produced with a camera, and required an eight hour exposure in bright sunshine. However this process turned out to be a dead end and Niépce began experimenting with silver compounds based on a Johann Heinrich Schultz discovery in 1724 that a silver and chalk mixture darkens when exposed to light.\n\nNiépce, in Chalon-sur-Saône, and the artist Louis Daguerre, in Paris, refined the existing silver process in a partnership. In 1833 Niépce died of a stroke, leaving his notes to Daguerre. While he had no scientific background, Daguerre made two pivotal contributions to the process. He discovered that by exposing the silver firstly to iodine vapour, before exposure to light, and then to mercury fumes after the photograph was taken, a latent image could be formed and made visible. By then bathing the plate in a salt bath the image could be fixed. In 1839 Daguerre announced that he had invented a process using silver on a copper plate called the Daguerreotype. A similar process is still used today for Polaroids. The French government bought the patent and immediately made it public domain.\n\nAcross the English Channel, William Fox Talbot had earlier discovered another means to fix a silver process image but had kept it secret. Aft
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Check out the University of Rochester in NY they also have a well known optics/laser program
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An MRI image where the various pulse times and signal strengths are chosen so the image shows fat and certain other materials as bright.  (As opposed to a T2-wieighted image which shows water as bright.)
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An optical mouse is an ordinary wired mouse that happens to use a light beam rather than a roller ball to sense movement.\n\nA bluetooth mouse is a wireless mouse (bluetooth is a wireless technology).
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an iso file is an optical disk image .. either cd or dvd ... open it with a burning app in the image burning section ... or open it with a virtual drivee like daemontools ... or open it with an editor like magic iso or isobuster ....
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a metric of a display system, defined as the ratio of the luminosity of the brightest and the darkest color the system is capable of producing. High contrast ratio is a desired aspect of any display, but with the various methods of measurement for a system or its part, remarkably different values can be measured of the same subject.