The drawings show three situationsA, B, and Cin which

Chapter 27, Problem 27.16

(choose chapter or problem)

The drawings show three situationsA, B, and Cin which light reflects almost perpendicularly from the top and bottom surfaces of a thin film, with the indices of refraction as shown. (a) For which situation(s) will there be a net phase shift (due to reflection) between waves 1 and 2 that is equivalent to either zero wavelengths or one wavelength (film), where film is the wavelength of the light in the film? (b) For which situation(s) will the film appear dark when the thickness of the film is equal to film? 1

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