Abd Al-Majeed , Kawthar H., Alaa B. Hasan, and Sameer H. R. Aldeen. 2025. “Evaluation of Optical Efficiency of Circular Cross-Section Torus Waveguide via Changing the Optical Parameters”. Ibn AL-Haitham Journal For Pure and Applied Sciences 38 (2): 102-14. https://doi.org/10.30526/38.2.3932.