Question: In Exercise 3, we have to setup and study the Fabry-Perot interferometer. Follow step 1-3 to setup the interferometer. A clear sharp interference pattern should

In Exercise 3, we have to setup and study the Fabry-Perot interferometer. Follow step 1-3 to setup the interferometer. A clear sharp interference pattern should be visible on the viewing screen. Now, gradually increase the separation D between the movable mirror and the fixed mirror: Relocate the fixed mirror and mount it on the heavy tripod. Put the assembly on the other side of the movable mirror near the interferometer base. Reverse the direction of the movable mirror such that it is facing towards the fixed mirror on stage. Also relocate the viewing screen behind the fixed mirror to observe the interference pattern. In this way, the optical path length difference of the interfering beams is increased. Make sure that you can still see the interference pattern on the viewing screen by adjusting the fixed mirror. Record how the interference pattern changes with the separation, D. Further increase the separation D up to 1 m by moving the fixed mirror further away from the movable mirror. Can you still see the interference pattern? If you do, what does it suggest to the coherent length of the laser light used in the experiment? Discuss reasons why the interference pattern remains or disappears in your experiment

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