Problem: What visible wavelengths of light are strongly reflected from a 390-nm-thick soap bubble? What color would such a soap bubble appear to be?

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Constructive interference:

λc=2.66d(m + 12)

m = 0, 1, 2, 3, ... n

λ is the wavelength of light in air.

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What visible wavelengths of light are strongly reflected from a 390-nm-thick soap bubble? What color would such a soap bubble appear to be?

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