borate glass meaning in Hindi

Examples

1. Such glasses are superior in performance to concrete and to other barium borate glasses.
2. The most common compositions are based on lead borates ( leaded borate glass or borosilicate glass ).
3. However borate glass with more than 20 mol . % of lanthanum oxide is very durable under ambient conditions.
4. Borate glasses have lower wavelength-refraction dependence in the blue region of spectrum than silicate glasses with the same Abbe number.
5. After 1930, George W . Morey introduced the lanthanum oxide and oxides of other rare earth elements in borate glasses, greatly expanding the available range of high-index low-dispersion glasses.
6. Glasses most closely approach the ideal of homogeneity and isotropy, and for accurate work, minerals are usually prepared by dissolving them in a borate glass, and casting them into a flat disc or " bead ".