| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
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| focal length |
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| 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. | 1 |
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| | | The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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