看这个!!!!!!!!!!!!!!!!!!!!!!!
http://www.google.com.hk/imgres?imgurl=http://www.xjoptics.com/product_list/pxgg/pxgg2.JPG&imgrefurl=http://www.xjoptics.com/product_list/PL_5.htm&usg=__9szxmO-Scksie5pdla2ndoligM0=&h=600&w=800&sz=65&hl=zh-CN&start=96&zoom=1&tbnid=7WkiYlG11_dISM:&tbnh=107&tbnw=143&ei=bs_fT_OuNYmjiAf4rPmWCg&prev=/search%3Fq%3D%25E5%25B9%25B3%25E8%25A1%258C%25E5%2585%2589%25E7%25AE%25A1%26start%3D80%26um%3D1%26hl%3Dzh-CN%26newwindow%3D1%26safe%3Dstrict%26sa%3DN%26gbv%3D2%26tbm%3Disch&um=1&itbs=1 哈,楼主想用着D个镜子吧? 大口径干涉仪?
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