| 摘要 |
An aspect of the present invention relates to an optical glass which contains P5+, Al3+, Ba2+, and R2+ (R2+ is one or more selected from the group including of Mg2+, Ca2+, Sr2+, and Zn2+) as essential cationic components and O2− and F− as essential anionic components, the total content of P5+, Al3+, Ba2+, R2+, and R′+ (R′+ is one or more selected from the group including of Li+, Na+, and K+) in the cationic component being 86% or higher, the Al3+/P5+ molar ratio being 0.70 or higher, the Al3+/(Ba2++R2+) molar ratio being 0.40 or higher, and the Ba2+/(Ba2++R2+) molar ratio being in the range of 0.50 to 0.85, and which has an Abbe's number &ngr;d of 72 or larger but less than 80, the refractive index nd and the Abbe's number &ngr;d satisfying: nd≧2.179−0.0085×&ngr;d. |
