Society of Glass Technology · [Sheffield] · leaf 144
PbO glasses, the soda glasshas always a higher r]D value than its corresponding K20 glass.Fig. 9 again illustrates this point. (6) In glasses of the Si02,R20,R0 type, where the alkali per-centage is kept constant and PbO or CaO is substituted for silica,there is a rise in the refractive index of… … 10 15 20 Percentage R0. Fig. 11. 10 15 Percentage R0.Fig. 12. refractive index for the D line than its corresponding lead glasswhen the silica content is higher than 60 per cent. The rate ofincrease of ^D with the substitution of R0 for Si02 is greater,however, with the PbO glasses than with the…
Glass
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