新编《初中物理第一册》扉页上的首幅彩图,是一个杯中水里的铅笔成像实验图。这个实验,不仅现象奇特,所用的器材很少,而且仅当改变实验方法和观察方法时,就会出现一连串魔术般的现象,真是“远近高低各不同,不识庐山真面目”。你不仿亲手做做看。先把铅笔垂直插入杯中水里的不同地方,你一面观看铅笔成像的大小,一面观看像与实物的相对位置;再将铅笔在水里做圆周运动,做前后、左右的直线运动,仍依上述方法 The first color picture on the newly edited book “The Book of Junior Physics 1st Edition” is a pencil imaging experiment in a glass of water. This experiment is not only phenomenal, but there are few equipments used, and only when the experimental methods and observation methods are changed, there will be a series of magic-like phenomena. It is really different in terms of distance and height. You don’t like to do it with your own hands. First insert the pencil vertically into different parts of the water in the glass. While you look at the size of the pencil image, look at the relative position of the image and the physical object. Then make the pencil in the water to do a circular motion and do a straight line movement around the front and back, left and right. The above method