The distance to a given fringe from the center of the screen:

$\overline{){\mathbf{y}}{\mathbf{=}}\frac{\mathbf{m}\mathbf{\lambda}\mathbf{D}}{\mathbf{d}}}$ D is the distance to the screen, d is the slit separation.

A monochromatic light wave falls on a double slit. As the slit separation decreases, the separation between the interference fringes

a) decreases

b) increases

c) remains the same

d) initially increases, then decreases

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