| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical glass having a high refractive index (nd) of 1.5 or higher achieving the thinning and lightening of an optical element and also having a high Abbe number (&ngr;d) of 70 or higher, and a preform and an optical element using the same.SOLUTION: Provided is an optical glass comprising P, Al, Srand Baas cationic component, and comprising Oand Fas anionic component, and whose refractive index (ns) is 1.50 or higher. The preform and optical element are made of this optical glass. |
