In Young’s double slit experiment, the slits are 2mm apart and are illuminated by photons of two wavelengths${\mathrm{\lambda }}_1=12000{\mathrm{A}}^{\circ }$ and ${\mathrm{\lambda }}_2=10,000{\mathrm{A}}^{\circ }$. At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?