When we are solving thin film interference problems, we compare the wavelength of the incident light to the thickness of the film. Which value should we use for the wavelength? O The value of the wavelength in the film, since that is where the path difference is occurring. O The value of the wavelength in air, since we are treating air as if it is a vacuum and it is customary to use vacuum wavelengths. O We use the wavelength of the incident light, which is the same in the film as it is in vacuum

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