Difference between revisions of "Focal Plane (of a light)"
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Latest revision as of 02:58, 3 February 2024
2-2-170
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)
