| http://www.w3.org/ns/prov#value | - Namely, the invention relates to a photochemically refractive-index-changing polymer characterized in that the polymer is a polymer of one or more monomers comprising an acrylic vinyl monomer represented by the following formula (1): CH2???C(R1)C(???O)O???R2???CH2???(1) (wherein R1 is a hydrogen atom or a methyl group and R2 is a saturated or unsaturated hydrocarbon group having 1-20 carbon atoms,
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