试题与答案

利用平面镜可以改变光线的______.光线与平面镜的夹角是90°时,光线的入射角

题型:填空题

题目:

利用平面镜可以改变光线的______.光线与平面镜的夹角是90°时,光线的入射角是______;当入射光线与镜面的夹角由30°增大到35°时,则反射角______5°(选填“增大”或“减小”).

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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