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wu yi ke ben shang de ti xiao er bu wei yong mo xing tan jiu ke ben shang de yi dao xi ti
Author(s): 
Pages: 34-35
Year: Issue:  6
Journal: ZHONGXUE SHUXUE ZAZHI(GAOZHONG BAN)

Abstract:  1 问题的提出 人民教育出版社中学数学室编著<全日制普通高级中学教科书>(必修)数学第二册(上)第96页练习第5题:一束光线垂直于一个墙面.将一块圆形纸板置于光源与墙面之间,墙面上会出现纸板的影子,变化纸板与光线的角度,影子的形状也会发生变化.观察这些影子会出现哪些不同的形状.
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