| http://www.w3.org/ns/prov#value | - FIG. 31A is a plan view of a third example of the aperture limiting element 2801 of FIG. 28, and FIG. 31B is a cross-sectional view taken along the line B--B of FIG. 31A. Reference numeral 3101 designates a glass substrate on which a grating 3102, an interference filter layer 3103 are formed.
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