A Young's Interference Experiment Is Conducted with Violet Argon Laser

Multiple Choice

A Young's interference experiment is conducted with violet argon laser light (λ = 409 nm) .The separation between the slits is 0.66 mm,and the interference pattern appears on a screen 3.8 m away.What is the spacing between the bright fringes? (1 nm = 10−⁹ m)

A) 1.5E-3 m
B) 2.4E-3 m
C) 1.5E+4 m
D) 4.7E-3 m
E) 1.6E-3 m