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

Multiple Choice

A Young's double-slit apparatus is set up where a screen is positioned 1.2 m from the double slits.If the distance between alternating bright fringes is 0.83 cm,and the light source has a wavelength of 579 nm,what is the separation of the double slits? (1 nm = 10−⁹ m)

A) 1.2E-2 m
B) 8.4E-5 m
C) 7.0E-6 m
D) 9.0E-5 m
E) 4.0E-9 m