Entrance angle definition
Entrance angle means the angle between the illumination axis and the reference axis. The entrance angle consists of a vertical component (symbol 1) and a horizontal component (symbol 2).
Entrance angle means the angle between the illumination axis and the reference axis. The entrance angle consists of a vertical component (symbol β1) and a horizontal component (symbol β2). For any direction the vertical angle β1 is always given first. NOTE 1 These angles are usually not larger than 90° but, for completeness, the full range is defined as -90° < β1 < 90° and -180° < β2 < 180°. NOTE 2 The entrance angle is sometimes as well referred to as illumination angle.
Entrance angle means the angle characterizing the angular position of the retro reflector with respect to the direction of the incident light.