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1、光的反射教案光的反射教 学 目 标12通过实验，观察光的反射现象。经历探究“光反射时的规律”，用实验的方法获得反射光线、入射光线跟法线位置的关系，测量反射光线与法线、入射光线与法线的夹角，总结探究的结论，获得比较全面探究活动的通过观3教学重点：光的反射定律，镜面反射和漫反射精品资料-欢迎下载-欢迎下载 名师归纳-第 1 页，共 4 页 -教学难点：光的反射定律的应用教具：平面镜、激光笔、硬纸板、量角器、大头针、光具盘教学过程：一、引入新课物理与生活：1.光源发出光，为什么我们可以看见它？不发光的物体我们又是怎样看到它们的呢？2.当你从镜中看到对方时，对方是不是也能看到你？二、新课讲授（一）光的
2、反射演示光在平面镜上的反射，观察逃跑光路，让学生对光的反射有个感性认识，然后教师在黑板上画出光的反射光路图，向学生介绍“入射光线、反射光线、入射点、法线、入射角、反射角”等物理术语及其含义。光遇到水面、玻璃以及其他任何物体的表面都会发生反射，我们看到不发光的物体，都是由于它们的表面能反射光，反射光进入了我们的眼睛，人就看到了物体。反射的定义：光从一种介质射向另一种介质表面时，有部分光返回原介质中传播的现象叫做光的反射。（二）光的反射定律提出问题：光反射遵循什么规律呢？也就是说反射光线沿什么方向射出？精品资料-欢迎下载-欢迎下载 名师归纳-第 2 页，共 4 页 -文档编码:CJ10F9W4R9
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4、9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4
5、R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W
6、4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9
7、W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F
8、9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10
9、F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10制定计划与设计实验：把一个平面镜放在桌面上，再把一张纸板竖直地立在平面镜上，使纸板上的直线ON垂直于镜
10、面，用红色激光笔，沿某一角度紧贴纸板向O点射出入射光线，观察反射光线的位置和方向，从而总结出光的反射规律。进行实验：用激光笔发射出一束红光，贴着垂直放置在平面镜上的纸板，沿某一个角度射到 O点上，经平面镜反射后，沿一方向射出，在纸板上用彩笔描出入射光和反射光的径迹。改变入射光的方向重做两次，用不同颜色的彩笔记录光的径迹。用激光笔从反向光线一侧逆着照过去，观察反射光的径迹。取下纸板，用量角器量出入射角i和反向角r.实验记录：分析与论证：三线共面两角相等两线分居光路可逆(三)镜面反射和漫反射利用课本上提到的太阳光射到平面镜上和白纸上产生的不同效果提出问题，让学生思考，引发学生的学习愿望。如果有太阳
11、光射入教室，还可以演示给学生看看：太阳光斜射在平面镜上，会在墙上产生一个明亮的光斑；射到白纸上则不会产生光斑。提出问题：这是为什么?引发学习兴趣。1.镜面反射：光滑镜面的反射叫做镜面反射。如：黑板反光、擦得很亮的皮鞋很光亮、抛光的金属表面刺眼、漆得很亮的家具、平静的水面、平面镜、古代的铜镜等。2.漫反射：凸凹不平的表面的反射，反射光向着四面八方。如：电影屏幕、我们从各个方向看到各种不发光的物体。3.两种反射都要遵守光的反射定律。次数入射角i反向角r123精品资料-欢迎下载-欢迎下载 名师归纳-第 3 页，共 4 页 -文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6
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15、1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6
16、B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX
17、6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 Z
18、X6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10利用插有大头针的硬纸板做成凸凹不平的表面，配有光路图来说明漫反射也遵守光的反射定律。三、小结：“动手动脑学物理”课后反思：本实验用的激光笔头最好用梅
19、花形的，这样更容易在同一平面内观察到入射光线和反射光线；还可以用激光笔演示镜面反射和漫反射；探究前，应向学生介绍实验装置：光源、平面镜、由一块白硬纸板组成的光屏，说明各部分的作用。板书设计二、光的反射（一）光的反射1.几个物理术语：法线、入射光线、反射光线、入射点、入射角、反射角2.定义：光从一种介质射向另一种介质表面时，有部分光返回原介质中传播的现象。（二）光的反射规律：三线共面两角相等两线分居光路可逆（三）两种反射1.漫反射：表面凸凹不平2.镜面反射：光滑表面3.两种反射都遵守光的反射定律精品资料-欢迎下载-欢迎下载 名师归纳-第 4 页，共 4 页 -文档编码:CJ10F9W4R9E10
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21、0 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E
22、10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9E10 HA9B4J9V1Q2 ZX6B1I6V1Z10文档编码:CJ10F9W4R9
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