| http://www.w3.org/ns/prov#value | - The period and the angle of incidence of the beam on the surface 24, for example as measured by the angle between a perpendicular to the surface 26 and the chief ray 52, is selected so that the chief ray 58 of the deflected beam 60 has a wavelength equal to the wavelength at the center of each spectral increment or step (corresponding to each angular step of rotation of the motor shaft 14) and thi
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