| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical glass which has a high refractive index high dispersibility, and in which a partial dispersion ratio is small, and transmittance is excellent.SOLUTION: The optical glass includes: by mol%, 10.0-60.0% of a POcomponent; 5.0-45.0% of an NbOcomponent; 0-30.0% of a TiOcomponent; and at least 5.0% and less than 30.0% of a BOcomponent based on all glass amounts of substance of an oxide conversion composition, wherein a partial dispersion ratio (θg, F) with an Abbe number (ν) satisfies the relation of (-0.0016×ν+0.63460)≤(θg, F)≤(-0.00563×ν+0.75873) in the range of ν≤25, and the relation of (-0.0025×ν+0.65710)≤(θg, F)≤-0.0034×ν+0.70300 in the range of ν>25. |
