Four very narrow slits, each separated by 3.20 × 104 meter from the next, are illuminated by a 640 nanometer laser and the resulting interference pattern is observed on a screen 4 meters away. The intensity on the centerline is 565 mW/m2.
(a) Evaluate the intensity on the screen, a distance 6.00 millimeter away from the centerline?
(b) Find what is the new intensity at that location if any one of the four slits is covered up?