| focal point |
(1) The central or principal point of focus. (2) The optical center of a lens when it is focused on infinity.
출처: photographytips.com/page.cfm/2011
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| focal plane |
A plane passing through either focal point of a lens that is perpendicular to the principal axis. For a converging lens, any incident parallel beam of light converges to a point somewhere on a focal plane. For a diverging lens, such a beam appears to come from a point on a focal plane.
출처: www.nksd.net/schools/nkhs/staff/john_daneau/cp_glo...
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| focal point |
For a converging lens, the point at which a beam of light parallel to the principal axis con
출처: www.nksd.net/schools/nkhs/staff/john_daneau/cp_glo...
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| focal length |
The distance from the objective lens or mirror to the point where the light converges, the focal point. This distance is usually measures in millimeters.
출처: home.earthlink.net/~dreyna14/glossary.htm
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| focus |
A Windows term indicating the currently selected application, or one of its windows, to which all user-generated input (keyboard and mouse operations) is directed. The title bar of a window with the focus is colored blue for the default Windows color scheme.
출처: docs.rinet.ru/NTServak/glossary.htm
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