Double-Slit Interference Practice Test

Two coherent slits produce an interference pattern. One slit is partially covered so its transmitted wave amplitude decreases, but the wavelength and geometry are unchanged. What happens to the locations of the bright fringes?

Two slits are illuminated by the same laser so the waves leaving the slits have a constant phase relationship. On the screen, the central bright fringe occurs where the path difference is zero. Which change increases the spacing between adjacent bright fringes on the screen without requiring any calculation?​