A Young's Double-Slit Apparatus Is Set Up So That a Screen

Multiple Choice

A Young's double-slit apparatus is set up so that a screen is positioned 2.1 m from the double slits,and the spacing between the two slits is 0.033 mm.What is the distance between alternating bright fringes on the screen if the light source has a wavelength of 678 nm? (1 nm = 10−⁹ m)

A) 3.0E-4 m
B) 4.3E-2 m
C) 2.1E-2 m
D) 4.7E-2 m
E) 1.1E-2 m