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当平面波入射到不同介质的分界面时．会产生反射与折射。对有耗介质,或在界面处产生全反射现象时，折射角为复数。复数折射角常使人感到困惑。本文将给出在不同情况下由复数折射角导出的等相面行进方向角和相速度以及等振幅面的衰减方向角和衰减常数的简洁计算公式，从而揭示复数折射角的物理意义。
When a plane wave is incident on the interface of different media. Will produce reflection and refraction. For lossy media, or total reflection at the interface, the refraction angle is complex. Complex refraction angles often make people feel confused. In this paper, we will give a concise calculation formula for the declination direction and attenuation constant of the isotropic plane traveling direction angle and phase velocity derived from the complex refraction angle under different conditions, and reveal the physical meaning of the complex refraction angle.