focal length
Definition from Wiktionary, a free dictionary
[edit] English
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror
[edit] Noun
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Plural |
focal length (plural focal lengths)
- (optics) The distance at which something (e.g. a lens, mirror etc.) is in focus; in air it is the distance along the optical axis from a "principal plane" of the lens to one of the lens's focal points.
[edit] Translations
distance
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