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单词 focal length
释义
focal length
noun[Cusually singular]
physicsspecialized
uk
/ˌfəʊ.kəl ˈleŋθ/us
/ˌfoʊ.kəl ˈleŋθ/
thedistancebetween apointwherewavesoflightmeetand thecentreof alens
焦距
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(Definition offocal lengthfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)
Examples from literature
  • On the other hand, the eye-glass must not be of such small focal length that the image appears indistinct and contorted, or dull for want of light.
  • The rapidity of a lens depends mainly on its aperture and its focal length.
  • The speed of a photographic lens depends on the ratio of the effective aperture to the focal length.
  • To overcome this obstacle to clear vision, and also to secure magnification, the focal lengths of the instruments were greatly extended.
  • We may apply eye-glasses of different focal length.

Examplesoffocal length

focal length
The aperture andfocallengthon the camera are set according to need.
From theCambridge English Corpus
The procedure was applied to the 3 mfocallengthoff-axis parabola.
From theCambridge English Corpus
Thefocallengthof the evolved system is 0.992298 and the sum of the distances is 0.09881 ($1/10).
From theCambridge English Corpus
Therefore, thefocallengthbecomes the key condition of the threshold producing the plasma in the condition of identical incident energies.
From theCambridge English Corpus
The principle of choosing afocallengthis to reduce the effects of the closure as weak as possible.
From theCambridge English Corpus
The pixel pitch and thefocallengthof the cameras are 0.0185 and 2.5 mm, respectively.
From theCambridge English Corpus
Thefocallengthis longer for a low-intensity front.
From theCambridge English Corpus
It may be necessary to set a largerfocallengthbecause of obstructions in the robot's path.
From theCambridge English Corpus
Such an individual receives a large numerical penalty equal to 500,000 plus 500,000 times the distance by which the backfocallengthis offset.
From theCambridge English Corpus
This is to be expected as it is known to be associated with thefocallengthof the laser.
From theCambridge English Corpus
It is obvious that the shorter thefocallengthis and the stronger the intensity at the focus will be.
From theCambridge English Corpus
The laser beam is focused by a 25-cmfocallengthsilver mirror through a 0.5-mm-thick fused-silica window into the laser-gas interaction chamber.
From theCambridge English Corpus
Three images are taken at the same positions as above, and for the samefocallengthand beam diameter.
From theCambridge English Corpus
The injected beam radius is 3 cm for the 3-mfocallengthand 6 cm for the 6-mfocallength.
From theCambridge English Corpus
This potential does not degrade significantly as thefocallengthincreases.
From theCambridge English Corpus
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
#https://dictionary.cambridge.org//dictionary/english/focal-length##
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更新时间：2025/2/10 23:00:39