PHY202L Name Lab 7 - Wave Interference 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 into it in order to let the light through. Compare the four scenarios. I am interested in your ideas about what is going on - you will only be graded on effort here. What do you think is happening to the light to create these different patterns? Write your ideas in the space below. 2 Light Source 3 4Part L Wave Interference Simulation Open the 3315']; Wave Interference simulation. Take some time to geta feel for the simulation features and controls. a. Try to recreate the pictures shown on page 1 using the simulation. Describe what you had to do with the simulation to reproduce the pictures. b. Compare what you learned from the simulation to your ideas from page 1. What ideas would you keep? What ideas would you change? (Dfdyou no'ce the u'm' [my]: Spot rightbebrhd the will}: case 4.?) c. What happens to the pattern on the screen when the lights are brought closer to each other or farther apart? d. What happens to the pattern when the slits are brought closer and farther apart? Interference from two slits: N 3 The pictures above show two ways of representing light waves from two slits. Three points are marked 1, 2, and 3 in the picture on the right. e. Predict the brightness of the light you would see on a screen placed at points 1, 2, and 3. f. Describe how you might use a picture like the one on the left above to support your prediction and explain what is happening at points 1, 2, and 3 on the right. I am interested in your ideas. Write down all the ideas you can think of. You can use the simulation to help you.PthDouhleSlltInteerame In the pictures on the last page, the rays are emitted in all directions from the slits but concentrate on the rays that are emitted in a direction 9 toward a distant screen (9 measured from the normal to the barrier). One of these rays has further to travel to reach the screen, and the path offers-ace is given by d sin'. - a to screen a. Predict the brightness on the distant screen if the path difference is exactly one wavelength 7t (or any integer number of wavelengths)? Explain your reasoning. b. Predict the brightness if the path difference is M2, 3M2, or 5M2, etc? Which equation below tells you the angles (3) at which you will see bright spots, and which one tells you the angles (3) for dark spots? Circle one: Bright or Dark d sin 6 = mi Circle one: Bright or Dark 0' sin .9 = (m + %)/'L m=0,il,i2.. c. What ideas from part 1e (page 3) would you keep, and which would you revise? d. How do the equations above supportyour predictions of brightness and the pattern shown on the right? MandeWcaan: If 9 is small (