Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is lamA = 595nm. The other wavelength is lamB and is unknown. On a viewing screen, the light with wavelength lamA = 595nm produces its third-order bright fringe at the same place where the light with wavelength lamB produces its fourth dark fringe. The fringes are counted relative to the central or zeroth-order bright fringe. What is the unknown wavelength?