Bahaaldeen Baha. kamal, A. and A.Hassan al-azzawi, M. 2021. A Study of Optical Properties of Tetraborate Glasses Containing CaO, MgO & BaO. Journal of Education and Science. 30, 1 (Mar. 2021), 10–23. DOI:https://doi.org/10.33899/edusj.2020.127127.1076.