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1、专题训练三 透镜(凸透镜、凹透镜) 姓名: 2011-1-18一)知识掌握基本要求:一)知识掌握基本要求: 1.透镜:透镜:表面是球面一部分的玻璃元件称为透镜。中间 边缘 的透镜为凸透镜,中间薄 边缘厚的透镜称为凹透镜。通过两个球面球心的直线称为主光轴(简称主轴) 。在主轴上有一 个特殊的点称为 ,通过 的光线传播方向不变。 2.凸透镜:凸透镜:对光有 作用,能使平行于主轴的光线分聚在主轴上的一点,这个点称为 ,用 F 表示。焦点到光心的距离叫做 ,用 f 表示。凸透镜可以成像,放大镜、幻灯机、 照相机都是利用凸透镜成像规律制成的。 3.凹透镜:凹透镜:对光有 作用。能使平行于主轴的光线的折射
2、线的反向延长线分聚在主轴上一点。 这点也称为虚焦点,用 F 表示。凹透镜只能成缩小正立的虚像凹透镜只能成缩小正立的虚像。 4.透镜对光的作用属于光的 。 (“反射”或“折射” ) 5.凸透镜的四条特殊光路:凸透镜的四条特殊光路:6. 7.凸透镜成像规律:凸透镜成像规律:物距 u 与焦距 f 的关系像距 v 与焦距 f 的关系像的性质应用1u2ff2f倒立放大实像投影仪4u = f不能成像5u20cm B. f8cm C. 10cmf16cm D. 8cmf10cm 1616、我们经常提到的像有:小孔成像;平面镜成像;放大镜成像;电影银幕上的像; 汽车观后镜中的像。其中( ) A由于反射而形成的
3、像是 B由于折射而形成的像是 C属于实像的是 D属于虚像的是17.17. 在2008年北京奥运会安保工作中将采用人脸识别系统,如图5,识别系统的摄像机可自动将镜 头前lm处人脸拍摄成数码相片,通过信号线传递给计算机识别,摄像机的镜头( )A相当于凸透镜,焦距可为01mR相当于凹透镜,焦距可为01mC相当于凸透镜,焦距可为05mD相当于凸透镜,焦距可为06m图 4-47内部资料,请勿外传!#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$vSTT#&ksv*3tnGK8!z89
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