很早以前,古人就对透镜有了认识。在1600多年前,我国学者张华在《博物志》一书中记载:“削冰命圆,举以向日,以艾承其影,则得火。”他的意思是:把冰削成中间厚,四边薄的圆饼,举起它向着太阳,把易燃的艾草放到会聚点上,便能引着火。这说明那时人们对凸透镜的会聚作用就有了认识。 Long ago, the ancients knew about the lens. More than 1600 years ago, Chinese scholar Zhang Hua wrote in the book “Natural History”: “If you cut ice, you give it to the sun, and if you think of it, you will get fire.” What he means is: cut ice into The thick, thin, round cakes in the middle lifted it towards the sun and put flammable wormwood on the point of convergence, which led to the fire. This shows that people have an understanding of the convergence of lenticular lenses.