| 摘要 |
An optical glass having refractive index (nd) exceeding 1.85, Abbe number (νd) of 36 or over, comprising SiO2, B2O3, La2O3, Gd2O3, Ta2O5 and Li2O as essential components, being free of Pb and As components, and having glass transition temperature (Tg) of 630° C. or below.
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