| http://www.w3.org/ns/prov#value | - FIG. 7 is a graph schematically illustrating a calculated intensity profile (solid curve) and wavefront phase-shift (dashed curve) along the X-axis of a collimated beam immediately after exiting a doublet group 32 of FIG. 4A. In this doublet group 32, element 34 is made from fused-silica and convex surface 34 thereof has a radius of curvature of 2.65 mm.
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