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同学们,你们知道手术室内的顶灯的样子吗?它们的功能又怎样呢?这得从光影关系谈起.由于光的直线传播,当光照射到不透明的物体上时,在物体的后面就会形成影子.影子在不同的地方、不同的时间又各不相同.比如,同一个人在阳光下的影子是早晚长,中午短.这个道理非常简单,这里不再赘述.通过仔细观察我们就可以发现、电灯光下的物体的影子中部特别黑暗,四周稍浅.影子中部特别黑暗的部分我们叫它本影,四周灰暗的
Students, do you know what the ceiling lights in the operating room look like? What about their function? This has to start with the relationship between light and shadow. Because the light travels in a straight line, when light strikes an opaque object, it will be behind the object. Shadows are formed. Shadows are different in different places and at different times. For example, the shadow of the same person in the sun is long and short, and it is short at noon. The reason is very simple and it will not be repeated here. Through careful observation we can discover The shadow of the object under the electric light is particularly dark in the middle and slightly shallow around. The dark part of the shadow is called the umbra, and it is dark