In a Young?s double slit experiment, the separation of the two slits is doubled. To keep the same spacing of fringes, the distance D of the screen from the slits should be made [MNR 1998; AMU (Engg.) 2001]

• A. \[\frac{D}{2}\]
• B. \[\frac{D}{\sqrt{2}}\]
• C. 2D
• D. 4D