The figure shows the interference pattern obtained in a double-slit experiment using light of wavelength 600 nm. Reference: Ref 27-1 Which one of the following phenomena would be observed if the wavelength of light were increased? Answer a. The fringes would be brighter. b. Single-slit diffraction effects would become non-negligible. c. The distance between dark fringes would decrease. d. More bright fringes would appear on the screen. e. The angular separation between bright fringes would increase.