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A sheet of glass with index of refraction, nglass= 1.51, is covered by a thin soap film with index of refraction, nfilm = 1.29. When
viewed from directly above (i.e. normal incidence), the soap film strongly reflects red light of wavelength, λred = 690 nm.
Write a symbolic expression for the minimum possible film thickness,
in terms of λred, nfilm, and/or nglass, then calculate its numeric value.
dmin =
nm

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