Two parallel narrow horizontal slits in an opaque vertical screen are separated center to center by d = 7 mm. These are directly illuminated by a plane wave from a filtered discharge lamp. Horizontal fringes are formed on a vertical viewing screen 9 m from the aperture plane. The center of the sixth bright band is y = 26 mm above the center of the zeroth/central bright band. a) Xo = Determine the wavelength Ao of the light in air. b) If the entire space is filled with a medium of an index of refraction n = 1.426, where would the sixth fringe now appear (find y)? y= 0

Two parallel narrow horizontal slits in an opaque vertical screen are separated center to center by d = 7 mm. These are directly illuminated by a plane wave from a filtered discharge lamp. Horizontal fringes are formed on a vertical viewing screen 9 m from the aperture plane. The center of the sixth bright band is y = 26 mm above the center of the zeroth/central bright band. a) Xo = Determine the wavelength Ao of the light in air. b) If the entire space is filled with a medium of an index of refraction n = 1.426, where would the sixth fringe now appear (find y)? y= 0