Difference between revisions of "Subtense Angle"

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'''2-2-190
'''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)
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)


[[Image:Ch2_Fig10.jpg|400px]]
[[Image:Ch2_Fig10.jpg|400px|border]]


[[Image:Ch2_Fig16.jpg|400px]]
[[Image:Ch2_Fig16b.jpg|400px|border]]


Note: In France, the subtense angle of an optical panel, measured in the horizontal plane, is called Ouverture.
Note: In France, the subtense angle of an optical panel, measured in the horizontal plane, is called Ouverture.
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{{IALAFooter}}
{{IALAFooter}}
See also [[Total Subtense]]


{{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]]

Latest revision as of 19:07, 8 July 2016

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

Ch2 Fig16b.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)

See also Total Subtense