【2017年整理】大象版科学六上册《探寻光的路线》ppt课件.ppt

实验一：镜面反射 注意反射光的角度跟镜面有什么关系？ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 镜面反射 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 光的行进路线-反射 光照射到镜面会改变传播方向，被反射回去，这种现象叫做光的反射也叫反光。 光是直线行进的，遇到透明物体会穿透，遇到不透明物体，会产生反射现象，并在背光处产生影子。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 我们为什么能看见发光物体? 光源本身发出的光进入眼睛。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 不发光的物体表面能反射光，反射光进入眼睛。 我们为什么也能看见不发光的物体? Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 在黑屋子里，为什么台灯亮后，就能看见书上的字了？我们来画出灯光的传播路线。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 凸面镜的表面是凸起的，当光线射到凸面镜 后，不会聚于一点，而是要发散开来。所以它要比尺寸相同的平面镜观察的范围要大得多。 凸（面）镜 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 实验二： 多面镜子的反射 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 请看在Z字形的镜筒里添加两块平面镜并把它放在合适的位置，沿水平方向射入镜筒的光线的路线就发生了改变。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 实验三： 不同材质的物质对光的反射 实验四： 不同颜色的物质对光的反射 通过实验你们发现了什么？ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 不同的物体反射光的能力不同。 物体越光滑，反射光的能力越强； 物体颜色越浅，反射光的能力越强； 什么颜色的物体，反射什么颜色的光。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspo