In Young's double-slit experiment, the wavelength of light was changed from 7000A˚ to 3500A˚ . While doubling the separation between the slits, which of the following is not true for this experiment?
(1) The width of fringes changes.
(2) The color of bright fringes changes.
(3) The separation between successive bright fringes changes.
(4) The separation between successive dark fringes remains unchanged.