A Double Slit Is Illuminated with Monochromatic Light of Wavelength

Multiple Choice

A double slit is illuminated with monochromatic light of wavelength 6.11 × 10² nm. The m = 0 and m = 1 bright fringes are separated by 1.8 cm on a screen which is located 3.5 m from the slits. What is the separation between the slits?

A) 4.0 × 10^-5 m
B) 8.0 × 10^-5 m
C) 1.2 × 10^-4 m
D) 1.6 × 10^-4 m
E) 2.4 × 10^-4 m