Question

3. In this diagram, the paths taken by light striking point B on the screen are shown. Laser beam B screen a) Is the distance traveled by light from the upper and lower slits the same in this case? Which path is longer? b) Suppose that the upper path distance is ml., where m is some integer. Assume that the lower path distance is longer than the upper path by an amount exactly equal to 1/2. In the boxes below, sketch the electric field vectors at point B of the light from both upper and lower slits, as well as the net electric field vector at point B. Explain your sketches. Electric field (at point B of light from upper slit Electric field (ar point B) of light from lower slät Net electric field at point B c) What can you say about the net magnetic field at point B? Explain. d) Based on your answers to [b] and [c], what do you expect to see on the screen at point B? Compare this with what you would see at point A. What would you expect to see on the screen at a point between points A and B? Explain in terms of the net electric field vector at those points. f) Suppose you looked at a point on the screen below point A, but as far away from A as is point B. What would you expect to see there? Explain. 3) Describe the pattern you would expect to see on the screen at other points, further removed from A. Explain.

Answer 1