What Happens to Rainbow Fringes with Monochromatic Red Light Diffraction?

[luckis11]

Consider one slit white light diffraction which produces rainbow fringe - black fringe - white fringe-black fringe-rainbow fringe. That is, continuous spectrum (or...two continuous spectrums). My question is, instead of white light, project monochromatic red light. What happens then leaving all other things unchanged?
1) Two thick red fringes, as thick and exactly where it was the thick red area of each previous rainbow. And perhaps also one thick red fringe in the middle.
2) One thick red fringe in the middle, and many more thick or thin red fringes around it. But no obvious connection whatsoever with how thick and where it was the thick red area of each previous rainbow.

 

[jtbell]

English-language advice: when talking about interference, we say "fringe", not "tossil".

In fact, "tossil" isn't even an English word as far as I know. I suspect you meant to write "tassel" which is a synonym for a completely different meaning of the word "fringe."