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    If single slit-diffracted white light is passed through a double slit, the central fringe is white. Is that because the waves of different wave lengths are travelling the same distance and aren't diffracted out into the spectrum? Either side of that, would you then have a spectrum fringe with only red and blue visible at the edges, with the other colours merged together in the centre? And then as you go further out, would the spectrum fringes be much wider, as the red light is spread out much greater than the blue light? And would you start seeing more definition of the other colours in the spectrum fringe between the red and the blue as the fringe spacing increased, because the different colours are being reinforced less?

    If that's all correct, what would increasing the slit separation do?

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