| 摘要 |
PROBLEM TO BE SOLVED: To provide optical glass having higher abnormal dispersibility, so that the optical glass can compensate chromatic aberration of a glass lens with high precision, having a high index of refraction, a low dispersibility (high abbe number), an abrasiveness lower than the glass of the prior art, and thus the optical glass being easy to be ground for processing; an optical element; and a preform.SOLUTION: There is provided optical glass which includes P, Al and Zn as cationic ingredients and at least one of alkaline-earth metals, and includes O and F as anion ingredients and has an abrasiveness of 440 or below. |
