INTRODUCTION Consider the four pictures shown below, showing pure yellow lights shining toward a screen. In 3 and 4, there is a solid wall between the light and screen, with one or two slits cut in to let the light through. Compare the four scenarios. We are interested in your ideas about what is going on - you will only be graded for effort here. What do you think might be happening to the light to create these different patterns? Discuss with your group and write your ideas in the space below. 2 Light Source W 4 1) The first image appears to be created using only 1 light source and no obstacles. 2 ) The second image appears to be created using 2 light sources and no obstacles. 3) The third image appears to be created using a single light source and an obstacle with 1 slit allowing light to pass 4) The fourth image appears to be created using a single light source and an obstacle with 2