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The mode structure of a HeNe-laser of wavelength 633 nm is studied with a scanning Fabry-Perrot interferometer. The two laser concave mirrors have the same radius of curvature. On an oscilloscope the following image is obtained. ball 420 MHZ 1- Calculate the frequency difference between TEM 004 and TEM 004+ (4 Points) 2- Calculate the cavity length of the Fabry-Perrot interferometer. (4 Points) 3- Name the peak A if the peak B is the TEM 014 (4 Points) 4- Draw a picture of how the image would look like on the oscilloscope if the laser was of type single mode frequency. (4 Points) 5. Calculate the curvature of the two laser mirrors based on your discussion in questions 2 and 3. (4 Points) You may find the following figure useful N 0.1.4+1 0,0.4 1.3.4-1 2.2.-1 0,2.4+1 0.0.4+1 0,5.4 0.1. 2.3.-1 3.2.-1 . 0,24 2.0.4 1.1.4 0.3.4 1.2.4 2.1.4