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实验时凸透镜为什么要正对太阳光
更新时间: 2020-09-17 00:00:00  

先将凸透镜正对太阳光,在透镜另一侧用光屏来回移动,直到光屏上出现一个最小最亮的光斑,则此时测凸透镜到光屏的距离为焦距。正对太阳光可以很方便得出凸透镜的焦点,知道焦点后就可以测出焦距了。

关键词: 实验 凸透镜 为什么 太阳光

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