《物理人教新课标八年级上光的折射(课件)1》由会员分享，可在线阅读，更多相关《物理人教新课标八年级上光的折射(课件)1（39页珍藏版）》请在金锄头文库上搜索。
1、复习提问：1.什么是反射？2.举例说明哪些现象属于光的反射？3.反射定律的内容是什么？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.海市蜃楼这种现象是怎么形成的呢？光经过不均匀的大气时发
2、生折射， 形成的虚像。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slide
3、s for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.加水无水观察思考：插入水中的筷子看上去是弯折的 ，这是不是因为来自筷子的光在通过水和空 气的过程中发生了某种变化？请仔细观察演 示实验。Evaluation only.Evaluation only. Created with Aspose.Slides
4、for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.实验现象的科学归纳：光从一种介质斜射入另一种介质时 ，传播方向一般会发生变化，这种现象 叫做光的折射o空气水空气水.注意：折射现象的产生是光从一种透明物质斜射入 另一种透明的物质时，在交界面处发生的。（同时 也会发生反射）Evaluation only.Eva
5、luation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1.一束光从空气斜射入水面时，光的_ 方向发生了改变，有一部分光被反射回空 气，这种现象叫做光的，还有一部分 光进入水中，光线发生，这种现象叫 做光的，这两个现象是发生的。传播反
6、射 偏折 折射同时Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.2.下列现象中,属于光的折射现象的是( )A.日月食的形成 B、物体在水中形成倒影C.插入水中的筷子向上弯折 D.影子的形
7、成 C关键看光是在同种介质中传播还是在不同介质中传 播.一般来说,发生光的反射时,反射光线与入射光 线在同一种介质中;发生光的折射时,折射光线与入 射光线在不同种介质中.补充:如何区分或识别光的折射现象 和光的反射现象呢?Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pt
8、y Ltd.Copyright 2004-2011 Aspose Pty Ltd.3.小明到湖边游玩,他站在岸上在湖中看到 了岸上的树,水中的鱼,空中的鸟, 自己在水中的倒影,他看到的景物属于光的 反射形成的是_,属于光的折射形成 的是_。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011
9、Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.入 射 光 线明确几个基本概念明确几个基本概念折射光线入射角折 射 角法法 线线入射点0界界面面水空气Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copy
10、right 2004-2011 Aspose Pty Ltd.光 反射时，反射光线、入射光线和法线在 同一平面内；反射光线和入射光线分别位于法线两侧；反射角等于入射角。折射折射折射折射折射规律和反射定律一样吗？折射规律是什么？反射定律是什么呢？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-201
11、1 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.实验探究光的折射规律Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.折射规律和反射定
12、律会 一样吗？光 反射 时，反射光线、入射光 线和法线在同一平面内；反射光线和入射光线分别位于 法线两侧；反射角等于入射角。折射折射折射折射Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.
13、光的折射规律1、折射光线、入射光线和法线在同一平 面内 2、折射光线和入射光线分居法线两侧 3、当光从空气斜射入水或其他介质中时 ，折射角小于入射角；当光从水或其他介 质斜射入空气中时，折射角大于入射角Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copy
14、right 2004-2011 Aspose Pty Ltd.4.当光线垂直射向介质表面时，传播方 向不改变 5.折射角随入射角的改变而改变。入射 角变大，折射角变大；入射角变小，折 射角变小 6.在光的折射中光路是可逆的Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pt
15、y Ltd.Copyright 2004-2011 Aspose Pty Ltd.光 路 可 逆 模 拟 实 验发生折射时，光路 也是可逆的。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Lt
16、d.光的折射光路图Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1、下列所示光路图中能反映光从玻璃斜 射入空气中的是（ ）空气 玻璃A空气 玻璃B空气 玻璃C空气 玻璃DCEvaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile
