In a double slit experiment, the slits are separated by a distance d and the screen is at a distance D from the slits. If a maximum is formed just opposite to each slit, then what is the order of the fringe so formed ?

• A

  $\frac{d^2}{2\lambda D}$

• B

  $\frac{2d^2}{\lambda d}$

• C

  $\frac{d^2}{\lambda D}$

• D

  $\frac{d^2}{4\lambda D}$