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在这个世界上,有一个与你朝夕相伴的忠心朋友,不管你走到天涯海角,他总是悄悄地跟着你,不管你愿意与否,他注定伴随你一生一世。那么这位常常被我们忘却的朋友是谁呢?细心的人就会脱口而出:“影子”。是的,影子。那么影子是怎样形成的呢?对影子的研究有无实际意义呢?看完以下的叙述,你就会对影子有更多的了解。由于光在同一种物质里是沿直线传播的,并且它只能够在透明物体中传播。这样,射向不透明物体的光被物体挡住,这样就在物体背光的那一边形成了影子。
In this world, there is a loyal friend who accompanied you day and night. Whether you go to the ends of the earth, he will always follow you quietly. Whether you are willing or not, he is destined to accompany you forever. Then who is this friend who is often forgotten by us? Careful people will blurt out: “shadow.” Yes, shadow. How does the shadow come into being? Is there any practical significance to the study of the shadow? After reading the following narrative, you will have a better understanding of the shadow. Since light travels in a straight line in the same substance, it can only propagate in transparent objects. In this way, the light that hits the opaque object is blocked by the object, so that a shadow is formed on the side of the object’s backlight.