An optical glass having a small photoelastic constant (.beta.) suitable
for parts for polarizing optical system and light polarization control
elements and having a refractive index (nd) within a range from 1.60 to
1.68 and an Abbe number (.nu. d) within a range from 40 to less than 65
comprises, as atoms constituting the optical glass,
TABLE-US-00001
P 5 10 mol %
Al 1 3 mol %
Ba 8 13 mol %,
Gd 1 5 mol %
Nb 0.1 3 mol %
F 15 35 mol % and
O 40 52 mol %.
