$2.$ Verify the Laser $3.$ On the control panel located on the right, Check the box next to Screen and Check the box next to Intensity. $4.$ Turn On the Laser. Watch for several seconds as the light passes through the slits to form a fringe pattern on the screen. Observe that as light from the two slits arrives at a point on a screen, constructive or destructive interference will occur. As a result, bright and dark bands $($fringes$)$ will appear on the screen. These are known as an interference patterns. $5.$ Increase the slit$-$to$-$screen distance, L by moving the barrier away from the screen. screen. Decrease the slit$-$to$-$screen distance and observe. Describe the changes in the Fringe Display, the Screen and the Intensity Graph.