GLASS, OPTICAL GLASS, GLASS RAW MATERIAL FOR PRESS MOLDING, AND OPTICAL ELEMENT

摘要

[Problem] The purpose of the present invention is to provide glass having excellent transmittance, an optical glass, a glass raw material for press molding, and an optical element. [Solution] A glass including at least one type of oxide selected from TiO2, Nb2O5, WO3, and Bi2O3 as a glass component therefor, having a total TiO2, Nb2O5, WO3, and Bi2O3 content of at least 20 mol%, and having a betaOH value indicated in formula (1) that fulfills the relationship indicated in formula (2). betaOH = - [1n(B/A)]/t ... (1); betaOH >= 0.4891 × 1 n (1/HR) + 2.48 ... (2).