| http://www.w3.org/ns/prov#value | - The transparent layer having the refractive index of 1.5 to 1.9 may be made of polyalkyl (meth)acrylates (e.g., polymethyl (meth)acrylate, polyethyl (meth)acrylate, polypropyl (meth)acrylate and the like), polystyrenes, polycarbonates, polyethylene terephthalates, polyvinyl chlorides, polyvinyl naphthalenes, polyvinyl carbazoles or a mixture of two or more kinds of them.
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