| http://www.w3.org/ns/prov#value | - While the thickness of the first optical element may vary with its composition, it is preferably from 10 ??m to 200 ??m, more preferably from 20 ??m to 200 ??m, particularly preferably from 30 ??m to 150 ??m, most preferably from 30 ??m to 100 ??m.
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