| 摘要 |
<p>An optical glass characterized in that it comprises 18 to 29 % of SiO2, 68 to 78 % of PbO and 0.1 to 3.5 % of TeO2, has chemical constants of a refractive index (nd) in the range of 1.75 to 1.87 and an Abbe's number (ξd) in the range of 21 to 28, and a minimum wavelength of the light which transmits the above glass having a thickness of 10 ± 0.1 mm with a transmissivity of 80 % including reflection loss is 420 nm or less.</p> |
