| focal length |
The distance at which light rays are brought into focus for a particular lens or mirror.
출처: www.thebeerchair.com/html%20documents/astronomy%20...
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| focal length |
The size of the angle of view of the lens, measured in millimeters. The smaller the number, the wider the lens. Zoom lenses have a range of focal lengths.
출처: www.dvspot.com/features/glossary.shtml
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| focal length |
Distance from a lens or concave mirror to where converging light rays meet.
출처: www.astro.virginia.edu/~rjp0i/museum/glossary.html
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| focal length |
Distance from the center feed to the center of the dish.
출처: www.satelliteretailers.com/glossary.html
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| focal length |
The distance from the focal point of a lens to the plane of the film (for viewers and cameramen, this is seen as the amount of area a lens can photograph from a given distance.)
출처: www.psu.edu/dept/inart10_110/inart10/film.html
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