Coherent light with wavelength 606 nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00...

Coherent light with wavelength 606 nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3.00 {rm m} from the slits. The first-order bright fringe is a distance of 4.84 {rm mm} from the center of the central bright fringe.For what wavelength of light will the first-order dark fringe be observed at this same point on the screen?