八年级物理上册3.3《探究平面镜成像特点》导学案(无答案)(新版)粤教沪版.doc

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1、13.3 探究平面镜成像特点学习目标 1、知道平面镜成像特点,会应用平面镜成像特点分析解释简单的现象。2、经历探究平面镜成像特点的过程,培养设计实验能力。3、了解平面镜和球面镜在生活中应用。合作探究 一、课前预习1、什么是平面镜(课前完成)叫做平面镜,平面镜能成像。2.平面镜成像的原理: 二、再探新知1.探究平面镜成像特点:提出问题:平面镜成像有哪些规律?猜想与假设:回忆我们平时照镜子的情形,想一想,平面镜成的像和你相比有什么特点?_ _制定计划与设计实验:【设计实验】 图中几位同学的讨论对你有启发吗? 思考讨论:课本 P57 所提供的实验器材的作用分别是什么?写出来和同学交流交流。 为什么要

2、选用两只完全一样的蜡烛? 2为什么要用玻璃板代替平面镜? 直尺的作用是什么? 进行实验与收集证据:请你利用玻璃板、支架、两只相同的蜡烛、火柴、纸、刻度尺和光屏(纸)等器材参照课本 P57 所示步骤完成该实验。实验次数物距/cm 像距/cm 像与物大小比较(填“放大”、“等大”或“缩小”)光屏上有无像123分析与论证:比较第 2、3 列结论是_比较第 4 列结论是_比较第 5 列结论是 2、作图题 (作出像、或物、或平面镜)3、平面镜的应用 阅读课本 P58,说说平面镜在生活和生产中有哪些应用?4、球面镜:阅读课本 P58-59 完成下列问题:1、凹面镜:对光线的作用_应用实例_B归纳总结:像与

3、物到镜面的距离_;像与物的大小_;像与物关于镜面对称。平面镜所成的像是_像。BAA32、凸面镜:对光线的作用_应用实例_自我检测1、赵帅同学站在平面镜前 2m 处,镜中的像高 1.5m,当他向镜面前进 1.5m 时,像距他 m,像高 m。2、人逐渐向平面镜靠拢的过程中,人在镜中的像( )A.变大 B.变小 C.不变 D.无法判断3、视力检查时要求被测人与视力表间隔 5m。小明借助一块平面镜检查视力(如图所示),则他应坐在镜前 m 处。图中小明正在用手示意他所看到的“E”字朝向,其示意方向应与视力表中“E”字的实际朝向 (选填“相同”或“相反”)。4、如图所示, AB 是物体, AB 是它在平面镜中所成的像,请根据平面镜成像的特点画出平面镜。

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