Which cross-section from the possibilities below matches what would be needed to make the fringe pattern seen?

The highly top of the film expose no reflected light, meaning that the thickness less than 1/4 the wavelength of visible light within the film, since the phase change on reflection for the beam from the first surface of the film is %u03C0 radians and the phase change of reflection from the second surface of the film is 0 radians, substance the interfering rays basically out of phase from that part of the film. Given this facts.

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