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yong bu deng shi jie tu tou jing cheng xiang wen ti
Author(s): 
Pages: 56-57
Year: Issue:  Z2
Journal: Required Reading for Junior Middle School Students

Keyword:  凸透镜成像焦距不等式组数学知识重要方法实像光屏物理问题计算物放大;
Abstract: <正>学习凸透镜成像这部分内容时,有一些涉及计算物距、像距或焦距范围的问题,要用到不等式或不等式组.用数学知识解决物理问题,是学好物理的一种重要方法.现举几例进行归类分析.一、判断焦距的范围例1将一支点燃的蜡烛放在距凸透镜20cm处,在光屏上得到一个缩小的像.当蜡烛距凸透镜14cm时,在光屏上得到一个放大的
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