| http://www.w3.org/ns/prov#value | - FIG. 7 is a graph showing the measured values of directional characteristics of the following optical members: an optical member having no prisms (curve a); an optical member having a prism apex angle of 100??? (curve b); an optical member having a prism apex angle of 90??? (curve c); and an optical member having a prism apex angle of 65??? (curve d).
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