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 incidence
incidence angle
angle of irradiation
angle that a light path makes with the normal to the plane of incidence
Note 1 to entry: The angle of incidence is expressed in radian (rad) or degree (°).
Note 2 to entry: This entry was numbered 17-40 in CIE S 017:2011.