Focal Plane (of a light): Difference between revisions
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The horizontal plane through the focus of the optical apparatus of the light. | The horizontal plane through the focus of the optical apparatus of the light. | ||
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Latest revision as of 08:51, 17 September 2026
The horizontal plane through the focus of the optical apparatus of the light.
Note: In lighthouse practice in some countries the term "focal plane" is used with the above meaning, although this is quite a different meaning from that of 2-2-165.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
