题目

如图所示，平面镜前有一点光源S发出的一束光线被平面镜反射后经过A点，请作出该光线的光路图． 答案：解：第一种作法：根据光的反射定律：在平面镜上找一点O，过O点垂直平面镜作出法线，找到入射角的大小，最后根据反射角等于入射角画出过A点反射光线，如图所示： 第二种作法：先通过平面镜作出发光点S的对称点S′，连接S′A交平面镜于点O，OA为反射光线，如图所示：在方框中找出适当的句子，补全对话。A: Hello, Michael. This is Kangkang speaking. B: I'd love to, but I'm afraid I'll have to go to the library.A: B: I think I'll be free next Saturday. Let's go hiking then.A: B: Let's make it half past six.A: B: At the school gate.A: OK, B: See you.A. When shall we meet?B. See you then.C. Would you like to go hiking（远足） with us this Saturday?D. Where shall we meet?E. When will you be free?