| http://www.w3.org/ns/prov#value | - Suitable examples of the substrate include articles formed from semiconductors, ceramics, metal, glass, silica glass, plastics, and the like. [0077] The shape of the substrate is not particularly limited and may be suitably selected according to the purpose, but a tabular shape is preferable. [0078] The different refractive index film is not particularly limited and may be suitably selected accord
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