| abstract |
The invention provides: an optical glass which comprises, in terms of % by mass on the basis of oxides, 13-27% of B 2 O 3 , 20-35% of La 2 O 3 , 5-25% of Gd 2 O 3 , 5-20% of ZnO, 0.5-3% of Li 2 O, 0.5-15% of Ta 2 O 5 and 0.5-10% of WO 3 , wherein the value of (SiO 2 +B 2 O 3 )/(ZnO+Li 2 O), which is the mass ratio of the total content of SiO 2 and B 2 O 3 to the total content of ZnO and Li 2 O, is 1.35-1.65; and a lens comprising the optical glass. |