| http://www.w3.org/ns/prov#value | - Although depicted as including two triangular prisms (see FIGS. 1 and 2), the prisms may be any suitable shape disposed on one or both sides of the polarizing layer to achieve the desired purpose of the PBS. In some embodiments, one or more of the outer surfaces of the first and second prisms, i.e. one of the surfaces not adjacent the polarizing layer, may be curved, either convex or concave, or m
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