如图所示，入射光线与平面镜成30°角，则_刷题宝

题干

如图所示，入射光线与平面镜成30°角，则（）

A：入射角是30°

B：反射角是60°

C：反射光线与镜面的夹角是60°

D：入射角增大5°，反射角减小5°

上一题下一题 0.0难度选择题更新时间:2016-09-19 01:53:34

答案(点此获取答案解析）

B

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阅读理解
Mary, Tom, Alan did different things in the past summer vacation. Here are what they had done:

	Mary	Tom	Alan
Where	China	Spain	Canada
When to leave	The first week in June	The last day of May	July 18^th, Monday
With	His parents	His best friends	His cousin
What	Went hiking. Visited some interesting places in Beijing. Went shopping.	Went shopping . Went camping. Watched bullfight（斗牛）	Spent time on the farm. Went fishing. Slept a lot.
How long	About one month.	Only two weeks	Fifty days
By	Plane and bus	Boat and plane	Plane and train

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，其中a=1﹣

\sqrt{2}

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