| 词汇 | focal-length |
| 释义 | focal length noun[ Cusually singular ] physics specializeduk /ˌfəʊ.kəl ˈleŋθ/ us /ˌfoʊ.kəl ˈleŋθ/ the distance between a point where waves of light meet and the centre of a lens焦距 Photography aerial photograph airbrush analogue aperture backlight backlighting expose ghosting glossy golden hour grainy halation happy slapping pap photojournalist photoshoot pic picture PillCam projection 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. Examples of focal lengthfocal length The aperture and focallength on the camera are set according to need. The procedure was applied to the 3 m focallength off-axis parabola. The focallength of the evolved system is 0.992298 and the sum of the distances is 0.09881 ($1/10). Therefore, the focallength becomes the key condition of the threshold producing the plasma in the condition of identical incident energies. The principle of choosing a focallength is to reduce the effects of the closure as weak as possible. The pixel pitch and the focallength of the cameras are 0.0185 and 2.5 mm, respectively. The focallength is longer for a low-intensity front. It may be necessary to set a larger focallength because of obstructions in the robot's path. Such an individual receives a large numerical penalty equal to 500,000 plus 500,000 times the distance by which the back focallength is offset. This is to be expected as it is known to be associated with the focallength of the laser. It is obvious that the shorter the focallength is and the stronger the intensity at the focus will be. The laser beam is focused by a 25-cm focallength silver mirror through a 0.5-mm-thick fused-silica window into the laser-gas interaction chamber. Three images are taken at the same positions as above, and for the same focallength and beam diameter. The injected beam radius is 3 cm for the 3-m focallength and 6 cm for the 6-m focallength. This potential does not degrade significantly as the focallength increases. See all examples of focal length 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. |
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