A 2-slit arrangement with 60.3 μm separation between the slits is illuminated with 508 nm light….

A 2-slit arrangement with 60.3 μm separation between the slits
is illuminated with 508 nm light. Assuming that a viewing screen is
located 2.14 m from the slits, find the distance from the first
dark fringe on one side of the central maximum to the second dark
fringe on the other side.
a. 72.1 mm
b. 25.4 mm
c. 36.1 mm
d. 54.1 mm