No fringes are observed
All the bright fringes become white
Only the central fringe is white and all other fringes are observed coloured
All the bright fringes are coloured between violet and red
If a white light is used in the double slit experiment, the different colours will be split up on the viewing screen according to their wavelengths. The violet end of the spectrum (with the shortest wavelengths) is closer to the central fringe, with the other colours being further away in order.