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过凹透镜焦点的光线如何折射
更新时间： 2020-10-24 00:00:00  

1、凹透镜对光线起光散作用，所以过焦点的光线经过凹透镜折射后会更加发散，过焦点的入射光线经凹透镜折射后其反向延长线穿过副焦点，然后进行光折射，与光的交点进行重合;

2、凡是通过光心不与主光轴重合而与入射光线平行的直线都可以称之为副光轴，过焦点且与主光轴垂直的平面叫做焦平面，副光轴和焦平面的交点叫做副焦点，透镜的焦点可以称之为主焦点，凹透镜便是这样进行光线的折射。

关键词： 凹透镜 焦点 光线 如何 折射

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