This research is to study the physical properties. Mechanical and optical glass in formula
20Na_2 O: (80-X) B_2 O_3: X Bi_2 O_3 when X = 15 20,,And 25 30% by weight. By studying the density measured with density meter Measure the absorbance with UV - and spectrophotometer hardness machine with Digital Vickers Hardness Tester study found that glass melting experiments in the formula.B2O3 - 20Na2O - xBi2O3 when x, was 1520 25 30 mol% respectively, and found that the glass with Bi2O3 to glass with transparent, with yellow to reach the brown, respectively. The density was between 3.3174 to 3.9407 g / cm3 hardness value 300.1 297.3 354.0 341,, and.3 9, respectively, and the absorbance of glass with Bi2O3 190-900 nm wavelength), it was found that the absorption edge position to the right. When the concentration of Bi2O3 more
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