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zhi zuo zhen kong zhao xiang ji
Author(s): 
Pages: 86
Year: Issue:  Z2
Journal: Required Reading for Junior Middle School Students

Abstract: <正>在较暗的屋子里,把一支点燃的蜡烛放在一块半透明的塑料薄膜面前,在它们之间放一块钻有小孔的纸板。由于光是沿直线传播的,塑料薄膜上就出现烛焰的倒立的像。这种现象叫做小孔成像。利用小孔成像可以制作针孔照
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