如图所示，光源S发出的一条光线射向水面，在水面处发生反射和折射后，反射光线经过A点，水中的折射光线经过P点，请你作出入射光线、反射光线和折射光线．
根据平面镜成像的规律，作出点光源S在平面镜中成的像S′，由于反射光线的反向延长线要过像点S′，连接AS′，其与水面的交点就是入射点O．
分别连接SO、OA、OP，可以确定入射光线、反射光线、折射光线．答案如下图所示．
| 阅读理解。 | |||||||||||||||||||||||||
| Sunny Language School We are a language school for children of 12-18. We want an assistant in the library, an English teacher, a gate- keeper, and a sports coach.
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| 1. Who can't go to Sunny Language School? | |||||||||||||||||||||||||
| A. A 13 - year - old child B. A 17 - year - old child C. A 15 - year -old child D. A 20 - year -old child | |||||||||||||||||||||||||
| 2. Who is not wanted in the ad? | |||||||||||||||||||||||||
| A. A waiter B. A teacher C. A sports coach D. A gate - keeper | |||||||||||||||||||||||||
| 3. Who doesn't need to speak English? | |||||||||||||||||||||||||
| A. A teacher B. A lab assistant C. A sports coach D. A gate- keeper | |||||||||||||||||||||||||
| 4. The sports coach must(必须)______. | |||||||||||||||||||||||||
| A. major in P.E. B. know two languages C. be healthy and strong D. All above | |||||||||||||||||||||||||
| 5. Who needs speak three languages? | |||||||||||||||||||||||||
| A. A lab assistant B. A teacher C. A sports coach D. A gate - keeper |
