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夏天在大树下乘凉时,你是否注意过阳光透过树叶之间狭窄的缝隙,投在地面上的光斑都是什么形状的?这是为什么呢?我们先来做几个小实验.实验1:将激光笔发出的光束垂直射入装有烟雾的矿泉水瓶,你有什么发现?实验2:将激光笔发出的光束垂直射入装有水和少量牛奶混合液的玻璃瓶,你有什么发现?从上述两个实验,我们可以发现,光在空气和水中都是沿____传播的.大量的实验表明:光在同种
Did you notice the sun shines through the narrow gaps between the leaves in the summer when you are enjoying the cool weather in the trees? What is the shape of the light spot that is cast on the ground? Here are a few small experiments: Experiment 1 What do you discover by experimenting a light beam emitted by a laser pointer vertically into a smoky mineral water bottle? Experiment 2: What do you discover by directing the beam from a laser pointer into a glass vial containing a mixture of water and a small amount of milk? From these two experiments we can see that light propagates along ____ in both air and water, and a large number of experiments have shown that light in the same species