The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.
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angle of observation
angle of view
angle that the viewing direction makes with the normal of the surface being viewed
Note 1 to entry: The angle of observation is expressed in radian (rad) or degree (°).
Note 2 to entry: This entry was numbered 17-41 in CIE S 017:2011.