In a Two-Slit Experiment, the Third Bright Fringe Away from the Central

Multiple Choice

In a two-slit experiment, the third bright fringe away from the central fringe is observed at an angle of 7.0°. If the wavelength of the light is 490 nm, what is the distance between the two slits?

A) 3.6 × 10^-5 m
B) 4.0 × 10^-6 m
C) 2.1 × 10^-6 m
D) 2.1 × 10^-5 m
E) 1.2 × 10^-5 m