作者a27281591 (皮皮)
看板Physics
標題[題目] diffraction grating 繞射光柵
時間Tue Jan 5 03:15:22 2010
[領域] 光學 diffraction grating
[來源] physics for scientists and engineers 2e (randall d. knight)
課本習題
[題目] Light passes through a 240 lines/mm grating and is observed on a
1.2-m-wide screen located 1.4m behind the grating. Three bright fringes
are seen on both sides of the central maximum.
What are the minimum and maximum possible values of the wavelength ?
[瓶頸]
d=10^-3/240=4.17*10^-6 m=3 L=1.4 y=1.2/2=0.6=1.4*tanθ
算出θ 帶入sinθ=mλ/d 求出λ=547.6nm 為最大值
可是最小值怎麼算都比最大值大 @@ 拜託強者了~
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◆ From: 163.25.118.131
※ 編輯: a27281591 來自: 163.25.118.131 (01/05 03:38)
※ 編輯: a27281591 來自: 163.25.118.131 (01/05 11:51)
1F：推 colorya2001:你有答案嗎? 我算出來最小值是最大值波長的3/4 01/05 12:12
2F：→ a27281591:沒有 @@ 我試試看 01/05 13:30
3F：→ a27281591:是正解!!! 01/05 13:40