| focal length |
The distance of the light path from the objective (primary lens or mirror) to the convergence of the beam. The convergent spot is called the Focus or Focal Point.
출처: www.opticalvision.co.uk/content.asp
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| focal length |
A lens' angle of view, most commonly indicated as wide-angle, normal or telephoto. Usually compared to a 35mm camera's lens.
출처: www.photoshopelementsuser.com/glossary.php
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| focal length |
The distance between a lens or mirror and its focal point. This length is usually stated in terms of the lens or mirror diameter f/4 means that the focal length is four times the diameter of the optic.
출처: www.ccastronomy.org/terminology.htm
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| focal length |
The distance from a lens to the focal point of the image projected by the lens. Usually expressed in millimeters, smaller focal lengths result in wider fields-of-view.
출처: www.vrtoolbox.com/qtvrglossaryeg.html
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| focal length |
the distance from the primary mirror or objective lens to where the light is focussed. This depends on the curvature of the lens or mirror.
출처: www.sctaas.com.au/Definitions.htm
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