| http://www.w3.org/ns/prov#value | - For instance, in FIG. 6 relating to the first embodiment, a conical reflection surface (whose inner surface is a reflection surface) having a vertex directed toward points 3 b and 6 a may be provided between points 3 a and 3 b of the first optical system and between points 6 a and 6 b of the second optical system.
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