Light of Wavelength 610 Nm Is Incident on a Slit

Multiple Choice

Light of wavelength 610 nm is incident on a slit of width 0.20 mm,and a diffraction pattern is produced on a screen that is 2.0 m from the slit.What is the distance of the second dark fringe from the center of the central bright fringe? (1 nm = 10−⁹ m)

A) 1.4 cm
B) 1.2 cm
C) 0.68 cm
D) 0.92 cm