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This shows parallel beams from two helium-neon lasers converging to the principal focal point of a 30 cm double convex lens. The rays then enter a diverging lens of focal length -10cm on the right. The laser beams were made visible with a spray can of artificial smoke.
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hyperphysics.phy-astr.gsu.edu/hbase/geoopt/foclen.html
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Focal length - Wikipedia, the free encyclopedia
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The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (defocuses) light. For an optical system in air, it is the distance over which initially collima...
en.wikipedia.org/wiki/Focal_length
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Zoom lens - Wikipedia, the free encyclopedia
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A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and thus angle of view), as opposed to a fixed focal length (FFL) lens (see prime lens). They are com...
en.wikipedia.org/wiki/Zoom_lens
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Module 5: Focal length of a lens ... We call the distance that the focal point is from the lens the focal length of the lens. ... The dioptric power of the lens is 1 divided by the focal length of the lens in meters.
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www.nfos.org/degree/opt11/module_05b.html
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The focal length of a lens establishes the field of view of the camera. The shorter the focal length is, the larger the field of view. The magnification factor of the picture of an object and the object's actual size can be found by dividing the focal length of the camera lens used by the focal length of a standard lens.
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hypertextbook.com/facts/2002/MiriamJanove.shtml
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Focal length of the lens, which is often inscribed on the front or side of a lens in millimetres or inches (eg, f = 50 mm), is the distance to the film from a point inside the lens, when the lens is focused at the infinity (*) mark.
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www.weeno.com/art/0599/62.html
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Take portrait shots like a pro with this small, lightweight telephoto zoom lens. A large aperture and fixed focal length make this an excellent lens for your APS-C sensor type camera.
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www.sonystyle.com/webapp/wcs/stores/servlet/CategoryDis...
www.sonystyle.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10551&storeId=10151&langId=-1&categoryId=32335
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Focal Length of Lens ... However, the size of the sun or moon image depends on the focal length of the camera lens. ... However, many good pictures of eclipses have been made with 35 mm cameras equipped with lenses of 2-inch (50 mm) focal length. So don't put your camera away because you don't have a long-focal-length lens.
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www.kodak.com/global/en/consumer/products/techInfo/p150...
www.kodak.com/global/en/consumer/products/techInfo/p150/p150b.shtml
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The system uses a variable focal length lens for embodiment of the three-dimensional imaging and motion detecting function. For this purpose, varying the focal plane of a variable focal length lens is a key role of the device, which is accomplished by a variable focal length micromirror array lens (MMAL).
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www.freepatentsonline.com/20070115261.html
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