Focus (of a fixed lens): Difference between revisions
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'''urn:mrn:iala:dic:2-2-0105''' | |||
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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) | 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) | ||
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Note: The term "focus" in its more general and correct sense is given in 2-1-125. | Note: The term "focus" in its more general and correct sense is given in 2-1-125. | ||
[[Image: | [[Image:Ch2_Fig16b.jpg|400px|border]] | ||
[[Image:Ch2_Fig18.jpg|400px]] | [[Image:Ch2_Fig18.jpg|400px|border]] | ||
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[[Category:Alphabetical Index]] | [[Category:Alphabetical Index]] | ||
[[Category:IALA Dictionary 1970-89 Edition]] | [[Category:IALA Dictionary 1970-89 Edition]] | ||
[[Category:IALA Dictionary 2023 Revision]] | |||
Latest revision as of 08:51, 17 September 2026
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)
