光线追迹模拟程序，图示了光线在变折射率中的轨迹追踪,Ray-tracing simulation program, the icon is changing the refractive index of light in the trajectory tracking

matlab子程序，用于光线追迹，计算光线经过透镜面后的坐标和方向。-MATLAB subroutine for ray tracing to calculate the coordinates and direction of light through the lens surface.