the reflective light filed distribution is studied in great detail with diffraction approach, which is based on the quasi-gaussian beam model of the light emitted from the multimode transmitting fiber and conclusions drawn by beckmann on the scattering light from random rough reflector 引入了beckmann關于隨機粗糙表面光散射理論的相關研究結論,基于衍射分析法建立了準高斯光經過反射面后的反射光分布模型。