3. Two optically flat glass plates, 16.0 cm long, are in contact at one end and separated by 0.0200 mm at the other end. The space between the plates is occupied by oil with index of refraction 1.45. The index of refraction of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. If the dark fringes are spaced 2.00 mm apart, what is the wavelength of the monochromatic light?
(A) 475 nm,
(B) 425 nm,
(C) 525 nm,
(D) 675 nm,
(E) 725 nm.

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詳解 (共 2 筆)

#6995597
題目解析 這個題目涉及干涉現象,特別是...
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#7407558
所以解答這題薄膜干涉的問題
不要受折射率的影響
我們只有代入公式即可
薄膜干涉暗紋和亮紋之間的間距有一個公式
Deltax=波長乘以長度再除以2nh
所以h是開口端=0.02
n是介質的折射率1.45
所以全部代入公式即可求得725nm
ㅤㅤ
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