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Diffraction - Green's Function, Helmholtz Equation with a source

Here we talk about boundary conditions in general; about string, free ends points, fixed end points etc.

      1_Helmholtz_Boundary_conditions.png

       1_Helmholtz_Boundary_conditions.png

Commenting: Expanding spherical outgoing wave in plane waves - from the text:

      2-expanding_spherical_in_plane-waves.png

       2-expanding_spherical_in_plane-waves.png

Green's Function method, Huygens principle in mathematical formulation

      3-Green-s_function_Dirac_function.png

       3-Green-s_function_Dirac_function.png

      4-Green-s_function_Huygens.png

       4-Green-s_function_Huygens.png

Fresnel and Fraunhofer diffraction terms
       5-Fresnel_and_Fraunhofer_terms.png

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