In Young?s double slit experiment the wavelength of light was changed from 7000 Å to 3500 Å. While doubling the separation between the slits which of the following is not true for this experiment [Orissa JEE 2002]

• A. The width of the fringes changes
• B. The colour of bright fringes changes
• C. The separation between successive bright fringes changes
• D. The separation between successive dark fringes remains unchanged