| http://www.w3.org/ns/prov#value | - Since as described above, the birefringence of the exposed portions of the matrix 16 differs substantially from that of the unexposed areas, the differential retardations of the respective types of elements also differ substantially, and r, is substantially less than r After emerging from the image matrix 16, the light beam 13 passes to a phase varying means shown as a variable phase plate 24.
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