Hello, All. I'm a student. I have a problem. I need numerically calculate of the intensity distribution of the full coherent radiation in the spatial filter(cylindrical geometry) (Katron's scheme). Input data: Focal length of lenses F = 1 (m) Length of the wave of radiation Lambda = 10-6 (m) The size of a crack on an entrance lens b = 0.01 (m) And it is specified, that the spatial filtration is made on 1,2,3 maximum and minimum. My questions: 1. What is the formulation of this questions?Can i use theory of Fraunhofer diffraction? 2. What is the plane where i need to calculate the intensity(May be Fourier plane)? Thank you very match.