http://en.wikipedia.org/wiki/File:Doubleslit.gif As shown in the link, diffraction is shown in the form of these kind of longitudinal waves. The diffraction pattern explains the wave interference pattern observed in the double slit experiment. However in the case of the delayed choice double slit experiment, or if there is only one transverse wave passing through the slit(s) then how can we explain these diffraction patterns with respect to the transverse wave. I understand that in the link, in the straight lines, one color is the crest and the other might be the trough. But how does the transverse wave explain the pattern of the colored bands after passing through the slit(those curves, how are they explained???)? Is it still one transverse wave which is sweeping out curvy areas or is it that the transverse wave is being split into multiple waves which are going in different directions thus totally spreading out and hence cover the entire curve(I know it's not exactly a curve)? Please help!!! Sorry for being such a physics novice!!!