| abstract |
AN OPTICAL GLASS IS DISCLOSED WHICH CONSISTS ESSENTIALLY OF (A) A GLASS BASE CONSISTING OF B2O3, LA2O3 AND SIO2, (B) OF ZRO2 AND TA2O5, AND (C) OF AT LEAST ONE CONSTITUENT SELECTED FROMA GROUP INCLUDING THE OXIDES AND FLUORIDES RESPECTIVELY OF SUCH METALS AS MAGNESIUM, CALCIUM, BARIUM, ZINC, LEAD, ALUMINUM, YTTRIUM, TITANIUM, NIOBIUM, AND TUNGSTEN. THE INDEX OF REFRACTION OF THE INVENTED GLASS RANGES IN DEPENDENCE ON THE PERCENTAGE OF THE INDIVIDUAL COMPONENTS FROM 1.80 TO 1.92 WHILE THE ABBE NUMBERS ARE BETWEEN 48 AND 35.0. |