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tu tou jing wei shi me neng hui ju guang xian
Author(s): 
Pages: 56-57
Year: Issue:  11
Journal: School Journal of Mathematics

Keyword:  凸透镜凹透镜会聚作用实验课本光学器件会聚光平行光线作用效果学习物理;
Abstract: <正>两个面都磨成球面,或者一个面是球面,另一个面是平面的光学器件叫透镜.透镜有两种,中间比边缘厚的透镜叫凸透镜,中间比边缘薄的透镜叫凹透镜,不同的透镜对光线的作用效果不同.从实验中我们可以看到凸透镜能够把平行光(比如太阳光)会聚到一点,而凹透镜则使平行光变得发散.可是为什么凸透镜对光线有会聚作用呢?课本
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