空气中两条光线a和b从方框左侧入射,分别从方框下方和上方射出,

空气中两条光线a和b从方框左侧入射,分别从方框下方和上方射出,其框外光线如图4-1-2所示.方框内有两个折射率n=1.5的玻璃全反射棱镜.图4-1-1给出了两棱境四种放置方式的示意图,其中能产生图4-1-2效果的是(    )

图4-1-1

图4-1-2

答案

解析:因为n=1.5,由sinC=可知光线通过全反射棱镜时可以发生全反射,观察图中a光线向下偏折,b光线向上偏折,对照四个选项可知选项B符合要求.

答案:B

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