Discussion
What does Huygens' principle state?
Answer: B
Huygens' principle says that a wavefront may be replaced by a distribution of secondary sources whose envelope forms the next wavefront, and it is the physical idea behind the whole aperture method: knowing the field across a surface is enough to determine the field everywhere beyond it. Radiation from currents is the wire antenna picture, diffraction is a consequence rather than the statement, and field decomposition is a matter of vector algebra. The principle converts a difficult source problem into a manageable boundary one.
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