【摘要】 应用几何光学原理分析研究掠入射（入射角为90°）时影响棱镜的出射光线和入射点的因素，并由Matlab得到了入射点与棱镜顶角、底角及材料折射率关系的曲线图，应用Visio模拟光线传播轨迹．结果表明，棱镜实验和折射率测量中，要找到文献所定义的出射光线，对入射角为90°的入射光线的入射点是有一定要求的，进一步加深对三棱镜折射的理解和认识，为实验提供理论参考依据．更多还原

【Abstract】 The geometrical optics principle is applied to analyze and study the factors that affect the exit ray and the entrance point of the prism when the incidence angle is 90°,and the curve diagram of the relationship between the entrance point and the top angle,bottom angle of the prism and the refractive index of the material is obtained by Matlab,and Visio is used to simulate the ray path. The results show that,in prism experiment and refractive index measurement,in order to find the outgoing light defined in the literature,there is a certain requirement for the incident point of the incident light with an incidence angle of 90°,which further deepens the understanding and know of prism refraction,and provides theoretical reference for the experiment.更多还原