In an optical system, the focal point is the position at which the rays converge into a single point of focus. After passing through this image plane the rays diverge.
Synonyms and Related Terms
Brennpunkt (Deut.); foyer (Fr.); point focal (Fr.);
Sources Checked for Data in Record
- ASTM, Standard Terminology of Microscopy, Annual Book of ASTM Standards, Section 14, General Methods and Instrumentation, ASTM, E175, 75-78, May 1982
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998