OPTICAL GLASS

摘要

Disclosed is an optical glass having a refractive index (nd) of not less than 1.9 and an Abbe number (?d) of not less than 25. The optical glass contains one or more substances selected from the group consisting of SiO<SUB>2</SUB>, B<SUB>2</SUB>O<SUB>3</SUB> and GeO<SUB>2</SUB>, and also contains La<SUB>2</SUB>O<SUB>3</SUB>, Nb<SUB>2</SUB>O<SUB>5</SUB>, Ta<SUB>2</SUB>O<SUB>5</SUB>, Li<SUB>2</SUB>O and ZnO.