| 摘要 |
<p>Provided is an optical glass having a refraction index of 1.70-1.89, an optical constant with an Abbe's number of 20-30, and excellent chemical durability. The optical glass contains a P<SUB>2</SUB>O<SUB>5</SUB> of 10-30, a Nb<SUB>2</SUB>O<SUB>5</SUB> of 25-50, a B<SUB>2</SUB>O<SUB>3</SUB> of 0.1-30, a BaO of 0.1-2, a Li<SUB>2</SUB>O of 0-10, a Na<SUB>2</SUB>O of 0.1-4, a K<SUB>2</SUB>O of 0-10, a Bi<SUB>2</SUB>O<SUB>3</SUB> of 1-20, a GeO<SUB>2</SUB> of 0-14, a TiO<SUB>2</SUB> of 0.1-5 and a WO<SUB>3</SUB> of 1-14 in mass %.</p> |
