shown in Figure 2.1.The interference equation can thus be solved for the slit separation: d=miD (m=0,1,2,3,.) While the interference fringes are created by the interference of the light coming from the two slits, there is also a diffraction effect occurring at each slit due to Single Slit diffraction.This causes the envelope as seen in Figure 2.2. Setup 1.Setup the laser at one end of the optics bench and place the Multiple Slit Disk in its holder about 3 cm in front of the laser.See Figure 2.3. 2.Cover the screen with a sheet of paper and attach it to the other end of the bench so that the paper faces the laser. screen Figure 2.3:Optics Bench Setup 3.Select the double slit with 0.04 mm slit width and 0.25 mm slit separation by rotating the slit disk until the desired double slit is centered in the slit holder.Adjust the position of the laser beam from left-to-right and up-and-down until the beam is centered on the double slit. Procedure 1.Determine the distance from the slits to the screen. Note that the slits are actually offset from the centerline of the slit holder.Record the screen position,slit position,and the difference between these (the slit-to-screen distance)in Table 2.1. 2.Turn off the room lights and mark the positions of the maxima in the interference pattern on the screen. 3.Turn on the room lights and measure the distance between the first order(m=1)marks and record this distance in Table 2.I.Also measure the distance between the second order (m=2) marks and record in Table 2.1.8 shown in Figure 2.1. The interference equation can thus be solved for the slit separation: y m D d  = (m =0,1,2,3,…) While the interference fringes are created by the interference of the light coming from the two slits, there is also a diffraction effect occurring at each slit due to Single Slit diffraction. This causes the envelope as seen in Figure 2.2. Setup 1. Setup the laser at one end of the optics bench and place the Multiple Slit Disk in its holder about 3 cm in front of the laser. See Figure 2.3. 2. Cover the screen with a sheet of paper and attach it to the other end of the bench so that the paper faces the laser. 3. Select the double slit with 0.04 mm slit width and 0.25 mm slit separation by rotating the slit disk until the desired double slit is centered in the slit holder. Adjust the position of the laser beam from left-to-right and up-and-down until the beam is centered on the double slit. Procedure 1. Determine the distance from the slits to the screen. Note that the slits are actually offset from the centerline of the slit holder. Record the screen position, slit position, and the difference between these (the slit-to-screen distance) in Table 2.l. 2. Turn off the room lights and mark the positions of the maxima in the interference pattern on the screen. 3. Turn on the room lights and measure the distance between the first order (m = l) marks and record this distance in Table 2. l . Also measure the distance between the second order (m = 2) marks and record in Table 2.1