The Fraunhofer diffraction equation and also the Fresnel diffraction equation predicts that the distance of the single slit to the observation screen is the only thing that defines that pattern.

Subsequently, the zero-order fringe is always the maximum for all the wavelengths in the far-field.

My experiments show that this is not correct. However, the main important thing is the refractive index of the barriers respect with the refractive index of the medium.

Subsequently, the zero-order fringe can be the maximum for the long-wavelength and destructive for the short-wavelengths in the far-field.

DOI: 10.13140/RG.2.2.23269.55527

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