| http://www.w3.org/ns/prov#value | - An optical disk according to claim 14, wherein the height of each said ridge and said first projections is given by: {(2n-1)/8-1/10}λ≦h0 ≦{(2n-1)/8+1/10}λ, where n is an integer and ?? is a wavelength of a laser beam irradiating said optical disk. 16.
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