1) A screen that is 1.0m wide is 2.0m away from a pair of slits illuminated by 633-nm light, with the screen centered between the slits. Find the highest-order bright fringe that will appear on the screen if the slit spacing is (a) 0.10mm and (b) 10µm.
2) Light of wavelength 589 nm is incident on a single slit that is 0.720mm wide, and the resulting diffraction pattern is observed on a screen 2.00m away. What is the distance between the two dark fringes on either side of the central bright fringe?