In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths λ1 112000 Å and λ2 = 10000 Å. At what minimrim distance from the corunon central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?
(a) 1 mm
(b) 3 m
(c) 8 mm
(d) 6 mm