| 摘要 |
<p>This invention is concerned with a glass for optical and/or ophthalmic applications having an index of refraction between about 1.78-1.82, an Abbe number greater or equal to 31, and a density less than about 3.80 g/cm<3> consisting essentially, expressed in terms of weight percent on the oxide basis, of: <TABLE> o</p> |
