| http://www.w3.org/ns/prov#value | - Hence, the present invention will prove particularly effective if it is applied to the case where the convex lens element 11 and the concave meniscus lens element 12 have an outside diameter of about 10-20 mm while themating surfaces 11a and 12a have a curvature radius of no more than 15 mm.The effectiveness of the present invention will be described below more specifically on the basis of experim
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