[問題] 跟雷射有關的題目?????
http://www.wretch.cc/album/show.php?i=brendan080&b=5&f=1422799527&p=3
這題他沒附圖,但好像是雷射可以把一個玻璃球懸浮在空中之類的
可是要用甚麼方法來解這題??
請高手幫幫我
感謝
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