[題目] diffraction grating 繞射光柵
[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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