I'm having a bit of trouble with this problem: Three slits of negligible width are cut into points y=-d,0,d on a screen. A second screen is placed parallel to the first a distance L(L>>d) away. Light is projected through the slits onto the screen, forming an interference pattern. Express the intensity of the pattern in terms of L, d, lamda, I_0 (the intensity of each beam individually), and the height h along the screen. I'm not sure exactly how similar this triple slit experiment would be compared to the more common double-slit experiments. I would appreciate it if the differences between the two were explained. Thanks in advance for any and all responses.