In Young’s experiment, two coherent sources are placed 0.90 mm a part and fringe are observed one metre away. If it produces second dark fringe at a distance of 1 mm from central fringe, the wavelength of monochromatic light is used would be : 

• A

  $60 \times {10}^{-4} cm$

• B

  $10 \times {10}^{-4} cm$

• C

  $10 \times {10}^{-5} cm$

• D

  $6 \times {10}^{-5} cm$