This process is experimental and the keywords may be updated as the learning algorithm improves. These keywords were added by machine and not by the authors. Electromagnetism This book presents a unified macroscopic theory of waves in accordance with the principle of special relativity from the point of view of the form invariance of the Maxwell. Finally, the use of the Fraunhofer approximation allows establishing a very useful relation between the far-field pattern of the diffracted field and the spatial Fourier transform of the field distribution immediately after the screen plane. 5 Waves in Nonlinear Transmission Lines with Active Parameters Preface of Wave Theory, Last Edition in 2008 by J. In particular the Fresnel approach is shown to be equivalent to the paraxial picture. Diffraction theory is described as an approximate theory of wave propagation. The propagation of quasi-collimated monochromatic light beams, Gaussian waves, is treated by using the paraxial approximation. This chapter briefly reviews those aspects of electromagnetic theory that are particularly relevant for optics. Light is an electromagnetic phenomenon that is described, in common with radio waves, microwaves and X-rays, by Maxwell equations.
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