在探究凸透镜成像的规律中,我们习惯运用蜡烛作为光源,因为它简单易行,这一点都深有体会.但是蜡烛自身沿透镜主轴方向有一定的厚度,使得物距并不是唯一的值,给确定像的位置带来困难,而且我们发现蜡烛在测量的过程中会越烧越短,不利于循环使用.每次做实验,在实验室里总能闻到一些异味,既不环保也容易引起火灾.整个年级做完后,学校购入的蜡烛比较可观,所购买的费用也不低. We are accustomed to using candles as a light source in exploring the laws of convex lens imaging, as it is easy to understand, but the candle itself has a certain thickness along the major axis of the lens so that the object distance is not the only value given to Determining the location of the image poses difficulties, and we find that the candles burn more and less in the measurement process, which is not conducive to recycling. Each experiment, in the laboratory can always smell some odor, neither environmental nor easy to cause After the whole grade was done, the candles purchased by the schools were quite substantial and the cost of buying was not low.