1. In a laboratory experiment, a diffraction grating produces an interference pattern on a screen. The screen will look like B. C. E. OA O B OC OD OE 2. A light ray passes through substances 1, 2, and 3, as shown above. The indices of refraction for these three substances are n 1, n 2, and n 3, respectively. From the directions of the ray, one can conclude that On1