题干

将一个平面镜斜放在水槽中,太阳光照射在平面镜上,光线与镜面夹角为55°,如图甲所示,则反射角应为____ 度.向水槽中加水,使平面镜的下部浸入水中,让太阳光照射在水下的平面镜上,调节水面高度和镜面角度,可以观察到白纸上出现一道“彩虹”,如图乙所示,这说明白光是由各种____ 混合而成的.

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35,色光 

同类题5

阅读下面材料,从每题所给的A、B、C、D四个选项中选出最佳选项。

     I am off on a trip on my own. Yes ! Alone! I can't wait to get going to Europe to see some cities I really want to visit. It is great because I can choose what I want to do in each city. I am going to travel by train on the Eurorail.

     The train trip was fast and the views of the countryside were amazing. Now I am in Salzburg, Austria. The quiet hills of Austria are a great place to relax. The movie The Sound of Music was filmed around this area. Mozart, the famous musician, was from here. I listened to some of his classical music.

     The train ride to Amsterdam was a long one. It gave me time to write some postcards to send back home. Amsterdam is a fun city, full of friendly locals and many tourists. I spent the whole day visiting the art museums here. The museum about the famous Dutch artist Van Gogh is filled with history and beautiful art. I took a boat ride and saw local people in traditional dress. I even got to taste some delicious Dutch cheese.

     Copenhagen, Denmark, is one of the safest places in the world. I spent a busy and nice day at the Tivoli Amusement Park. It is a huge park which even has concerts and dance shows. Hans Christian Anderson, a famous writer of children's books, was born in this city. I found a lovely bookshop and bought two of his fairy tale books, The Little Mermaid and The Ugly Duckling. My travels alone are done! What an adventure this trip has been! I love it.