Difference between revisions of "Subtense Angle"

From International Dictionary of Marine Aids to Navigation
Jump to navigation Jump to search
m (1 revision)
m (1 revision)
Line 15: Line 15:


{{languages|Subtense Angle}}
{{languages|Subtense Angle}}
[[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

2-2-190

The angle, with vertex at the focus, subtended by the edges of a lens or reflector, usually measured in a horizontal or vertical plane. (Figs. 10 and 16b)

Ch2 Fig10.jpg

File:Ch2 Fig16.jpg

Note: In France, the subtense angle of an optical panel, measured in the horizontal plane, is called Ouverture.

In Germany, the subtense angle of a fixed lens or of an optical panel, measured in the horizontal plane, is called Spannwinkel.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)