The reflective qualities of a dichroic beam splitter are dependent upon the polarization and angle of incidence of the incident light. Consequently, when the incident light has equal horizontal and vertical components, the same is not true of the transmitted and reflected light. Utilization of the polarization properties is described for a camera periscope on a cathode-ray tube display employing an exposure meter. The polarization and other characteristics of a ghost image arising from reflection at the second surface of the beam-splitter also are examined.
The mean angle of incidence is a complicated function of the distance of the source from the optical axis, the radius of the entrance pupil, and the distance to the reflector. For purposes of discussion, two specific values are indicated for every emitter located farther from the optical axis than the radius of the entrance pupil. When the reflectance is a function of the angle of incidence at wavelengths emitted by the phosphor, the variation of the angle of incidence with azimuth angle introduces a change in reflected flux for uniform excitation of the cathode-ray tube; that is, the dichroic mirrors are a source of shading in the reflected image.
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