OPTICAL GLASS, OPTICAL ELEMENT COMPOSED OF OPTICAL GLASS, OPTICAL SYSTEM INTERCHANGEABLE LENS, AND OPTICAL DEVICE

摘要

An optical glass includes, in terms of mol % of cations, a total amount of La³⁺, Y³⁺, and Gd³⁺ components falling within a range of from 5% to 65% and a total amount of Zr⁴⁺, Hf⁴⁺, and Ta⁵⁺ components failing within a range of from 5% to 65%, and a relationship expressed in Expression (1) given below is satisfied. (La³⁺+Y³⁺+Gd³⁺)×(Zr⁴⁺Hf⁴⁺+Ta³⁺) ≥400(%)²