Definitions from Wiktionary (focal length)
▸ noun: (optics) A measure of how strongly an optical system converges or diverges light, the inverse of optical power. In the simple case of a single convex lens, it is the distance along the optical axis from the principal plane of the lens to the lens's focal point (where, for instance, the film would be placed in a camera). For more complex or multi-element optical systems, focal length need not correspond to any obvious measurable physical distance.
equivalent focal length,
back focal length,
effective focal length,
front focal length,
calibrated focal length,
more...
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▸ noun: (optics) A measure of how strongly an optical system converges or diverges light, the inverse of optical power. In the simple case of a single convex lens, it is the distance along the optical axis from the principal plane of the lens to the lens's focal point (where, for instance, the film would be placed in a camera). For more complex or multi-element optical systems, focal length need not correspond to any obvious measurable physical distance.
Similar:
focalization,
f-number,
Fresnel number,
lense,
defocus,
focometer,
cofocus,
focusser,
f-stop,
fresnel,
more...
Types:
Phrases:
Adjectives:
afocal,
confocal,
varifocal,
parafocal,
caustic,
parfocal,
power,
diacaustic,
photovisual,
objective,
multifocal
▸ Words similar to focal length
▸ Usage examples for focal length
▸ Idioms related to focal length
▸ Wikipedia articles (New!)
▸ Words that often appear near focal length
▸ Rhymes of focal length
▸ Invented words related to focal length