A Fraunhofer Diffraction Pattern Is Produced from a Light Source

Multiple Choice

A Fraunhofer diffraction pattern is produced from a light source of wavelength 460 nm.The light goes through a single slit and onto a screen 0.9 m away.The first dark fringe is 4.5 mm from the central bright fringe.What is the slit width? (1 nm = 10−⁹ m)

A) 1.8E-4 m
B) 9.2E-5 m
C) 3.1E-5 m
D) 1.4E-4 m
E) 2.0E-2 m