18. A thin film with an index of refraction of 1.60 is placed in one of the beams of a Michelson interferometer. If this causes a shift of 8 bright fringes in the pattern produced by light of wavelength 580 nm, what is the thickness of the film?
(A) 1.5 μm
(B) 2.9 μm
(C) 3.9 μm
(D) 7.7 μm
(E) 16 μm
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統計: 尚無統計資料
統計: 尚無統計資料