question_answer

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