In Young's double-slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two wavelengths λ0=750 nm and λ=900 nm. The minimum distance from the common central bright fringe on a screen 2 m from the slits, where a bright fringe from one interference pattern coincides with a bright fringe from the other, is
(1) 1.5 mm
(2) 3 mm
(3) 4.5 mm
(4) 6 mm