| http://www.w3.org/ns/prov#value | - Although the azimuths of the plane of polarization of the linearly polarized plate of the polarizing filters 8, 8' are set to +45 and -45 degrees respectively according to the present embodiment, the present invention is not limited to such angles but may instead employ such figures as 0 and 90 degrees for differentiating the azimuths of the polarization planes of the linearly polarized plates of
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