一束光线从折射率为1.5的玻璃内射向空气,在界面上的入射角为45°.下

一束光线从折射率为1.5的玻璃内射向空气,在界面上的入射角为45°.下面四个光路图中正确的是（）

答案

解析:

本题考查全反射.设临界角为C,则

sinC==0.67 sin45°==0.707

入射角45°大于临界角C,发生全反射.

故正确选项为A.

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一束光线从折射率为1.5的玻璃内射向空气,在界面上的入射角为45°.下

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