CPC G02B 15/167 (2013.01) [G02B 3/02 (2013.01); G02B 13/18 (2013.01); G02B 15/15 (2013.01); G02B 27/0025 (2013.01)] | 20 Claims |
1. A lens, comprising:
unevenness within an optical effective diameter of an optical surface,
wherein an arithmetic mean roughness within the optical effective diameter of the optical surface is 20 nm or more and 50 mn or less, and
an average value of widths of protrusion portions of the unevenness on an average line of a roughness curve of the optical surface is 1/200 or more and 1/50 or less of the optical effective diameter of the optical surface.
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