In a Double-Slit Experiment, the Slit Separation Is $2.0 \mathrm {~mm}$

Multiple Choice

In a double-slit experiment, the slit separation is $2.0 \mathrm {~mm}$ , and two wavelengths, $750 \mathrm {~nm}$ and 900 $\mathrm { nm }$ , illuminate the slits. A screen is placed $2.0 \mathrm {~m}$ from the slits. At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other?

A) $4.5 \mathrm {~mm}$
B) $6.0 \mathrm {~mm}$
C) $3.0 \mathrm {~mm}$
D) $1.5 \mathrm {~mm}$