如图，一个三棱镜的截面为等腰直角ABC，为直角。此截面所在平面内的光线沿平行于BC边的方向射到AB边，进入棱镜后直接射到AC边上，并刚好能发生全反射。该棱镜材料的折射率为 ( )

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如图，一个三棱镜的截面为等腰直角ABC，

为直角。此截面所在平面内的光线沿平行于BC边的方向射到AB边，进入棱镜后直接射到AC边上，并刚好能发生全反射。该棱镜材料的折射率为 ( )

A：

B：　　

C：

D：

上一题下一题 0.0难度选择题更新时间:2017-05-27 01:49:29

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A

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Mike is a middle school student. He goes to school from Monday to Friday. His home is about 5 miles from school. He usually walks to school. It takes him 30 minutes to walk there. Nancy's home is a little farther. It's 20 miles from school. So she often takes the school bus. It takes her 15 minutes to get to school. Bob lives outside the city. It's a town 30 miles away from his school. He takes the subway. It takes him 8 minutes to get to school by subway. He can have breakfast at home and then leave for the subway station. He studies very hard.

Name	How	How far	How long
Mike	He ____	It’s about 5 miles from school	____
____	She takes the school bus	It’s____ from school	15 minutes
Bob	He ____	It’s 30 miles from his school	20 minutes

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