Difference between revisions of "Focus (of a fixed lens)"
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{{languages|Focus (of a fixed lens)}} | {{languages|Focus (of a fixed lens)}} | ||
[[Category:2.2 Optical Apparatus] | [[Category:2.2 Optical Apparatus]] | ||
[[Category:Alphabetical Index]] | [[Category:Alphabetical Index]] | ||
[[Category:IALA Dictionary 1970-89 Edition]] | [[Category:IALA Dictionary 1970-89 Edition]] | ||
Revision as of 00:05, 25 February 2009
2-2-105
The point of intersection of the axis of the lens (2-2-115) and the median horizontal plane through the belt. A ray of light emitted by a point source situated at this point is re-directed by an element of the lens into a direction normal to the axis of the lens. (Figs. 16b and 18)
Note: The term "focus" in its more general and correct sense is given in 2-1-125.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
