| http://www.w3.org/ns/prov#value | - Since the second cylindrical lens unit 8 b shown in FIG. 8 is substantially the same as the first cylindrical lens unit 8 a in constitution except for the focal distance of the second cylindrical lens 81 b and that the second cylindrical lens 81 b is positioned such that its converging direction becomes perpendicular to that of the first cylindrical lens 81 a, the same members are given the same r
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