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如何利用凸透镜测凹透镜的焦距
更新时间: 2020-07-01 00:00:00  

让一束平行光照在凸透镜上,测出凸透镜的焦距f1,把凹透镜放在折射光的一侧,移动凹透镜,直到从凹透镜出来的光也是平行光时为止,测出两透镜间距a,则f2等于f1减a,原理:本应相交在凹透镜焦点上的入射光线,经凹透镜折射后,折射光线与主轴平行,焦距:焦点与光心的距离。

关键词: 如何 利用 凸透镜 凹透镜 焦距

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