This is the earliest pinhole image formation experiment and the earliest cognition of rectilinear propagation 八条中的后三条叙述了反射（平面、凹面、凸面）镜成像现象。
2.
Especially the third one describes the pinhole image formation experiment and analogies rectilinear propagation with the archery flight 这是世界上最早的针孔成像实验，也是对光的直线传播特性的最早认识。
