| 摘要 |
An optical glass suitable for precision press molding has a refractive index (nd) of 1.88 or over and an Abbe number (nud) within a range from 22 to 28, comprises, in mass %, and has a glass transition point (Tg) within a range from 500° C. to 580° C. The optical glass preferably has a yield point (At) within a range from 550° C. to 640° C.
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