用衍射追迹实现衍射受限透镜成像。复习菲涅尔衍射计算的S FFT算法，掌握用衍射追迹完成理想单透镜系统成像编程计算，体会和理解透镜尺寸大小对衍射受限系统成像质量的影响。-Limited by diffraction tracing the implementation of the diffraction lens imaging.Review S- FFT algorithm of Fresnel diffraction calculation, master finish ideal sing