Double-slit interference: Coherent monochromatic light of wa…

Double-slit interference: Coherent monochromatic light of wavelength 632.8 nm passes through a pair of thin parallel slits. The figure shows the central portion of the pattern of bright fringes viewed on a screen 1.40 m beyond the slits. What is the distance between the two slits?

Double-slit interference: Light of wavelength 519 nm passes…

Double-slit interference: Light of wavelength 519 nm passes through two slits. In the interference pattern on a screen 4.6 m away, adjacent bright fringes are separated by  5.2 mm in the general vicinity of the center of the pattern. What is the separation of the two slits?