| 单词 | focal length |
| 释义 | focal lengthnoun Optics.the distance from a focal point of a lens or mirror to the corresponding principal plane. Symbol: f the distance between an object lens and its corresponding focal plane in a telescope. Also called focal distance. Origin of focal lengthFirst recorded in 1745–55 Words nearby focal lengthfocal distance, focal epilepsy, focal glomerulonephritis, focal infection, focalize, focal length, focal necrosis, focal plane, focal-plane shutter, focal point, focal ratio Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for focal lengthfocal length focal distancenounthe distance from the focal point of a lens or mirror to the reflecting surface of the mirror or the centre point of the lens Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cultural definitions for focal lengthfocal length The distance between the focal point of a lens (that is, the point at which the lens will focus parallel rays of light) and the lens itself. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Medical definitions for focal lengthfocal length n.The distance from the surface of a lens or mirror to its focal point.focal distance focus The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for focal lengthfocal length [ fō′kəl ] The distance between the optical center of a lens or mirror to its focal point. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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