| http://www.w3.org/ns/prov#value | - Accordingly, the shape shown in FIG. 4 is an example of a curved surface whose curvature including the sign increases toward the portions farther from the optical axis (increases from negative curvature of concavity on the object side to positive curvature of convexity on the object side), while the shape shown in FIG. 5 is an example of a curved surface whose curvature once increases and then dec
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