Interference fringes are observed on a screen by illuminating two thin slits 1mm apart with a light source $\left(\lambda =632.8nm\right)$. The distance between the screen and the slits is 100cm. If a bright fringe is observed on a screen at a distance of 1.27mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to:

• A

  $2nm$

• B

  $1.27\mu m$

• C

  $2.87\mu m$

• D

  $2.05\mu m$