Task: Translation
Input (Czech): Popisuje se optické sodnohlinitokremicité sklo, které obsahuje v mol. %: 60 az 80 SiO.sub.2.n.; 10 az 20 Na.sub.2.n.O; 0,5 az 10 Al.sub.2.n.O.sub.3.n.; 0 az 20 MO, kde MO predstavuje alespon jeden z kovových oxidu, vybraných ze skupiny ZnO, MgO, CaO, s výhodou 0,1 az 15 mol. % ZnO, MgO, CaO; a 0 az 10 B.sub.2.n.O.sub.3.n., s výhodou 0,1 az 10 mol. % B.sub.2.n.O.sub.3.n.. Suma oxidu SiO.sub.2.n.+ Na.sub.2.n.O + Al.sub.2.n.O.sub.3.n.= 70,5 az 95 mol.%. Suma oxidu M.sub.2.n.O.sub.3.n., kde M.sub.2.n.O.sub.3.n.je Al.sub.2.n.O.sub.3.n.a/nebo B.sub.2.n.O.sub.3.n.je v rozmezí 0,5 az 20 mol. %. Sklo vykazuje optickou bazicitu v intervalu 0,45 az 0,65; vysokou vnitrní spektrální propustnost skla o tloustce 2 mm nad 99,0 % v oblasti 400 az 2000 nm; index lomu 1,49 az 1,54; strední optickou homogenitu pod 2.10.sup.-4.n.a hydrolytickou odolnost pod 0,4 ml.g.sup.-1.n.[ml HCl (C=0,01 mol.l.sup.-1.n.)].
Output (English): Described is an optical sodium aluminosilicate glass that contains in moles. %: 60 to 80 SiO.sub.2.n; 10 to 20 Na.sub.2.n.O; 0.5 to 10 Al.sub.2.n. 0 to 20 MO, where MO represents at least one of the metal oxides selected from ZnO, MgO, CaO, preferably 0.1 to 15 mol. % ZnO, MgO, CaO; and 0 to 10 B, preferably 0.1 to 10 mol. % B.sub.2.nub.sub.3.n .. SiO2 sum.sub.2 + Na.sub.2N.sub.2 + Al.sub.2.sub.3 = 70, 5 to 95 mol%. Oxide Amount M.sub.2.nub.sub.3.n., where M.Sub.2.nO.sub.3 is Al.sub.2.nOs.3. is between 0.5 and 20 mol. %. The glass has an optical basicity in the range of 0.45 to 0.65; high internal glass transmittance of 2 mm thickness over 99.0% in the 400-2000 nm range; refractive index 1.49 to 1.54; medium optical homogeneity below 2.10.sup.-4 at hydrolytic resistance below 0.4 ml.g.sup.-1.n. [ml HCl (C = 0.01 mol.l.sup.-1.n.) ].