The validity of the Fresnel approximation
1987; IOP Publishing; Volume: 8; Issue: 1 Linguagem: Inglês
10.1088/0143-0807/8/1/010
ISSN1361-6404
Autores Tópico(s)Optical measurement and interference techniques
ResumoThe author confirms the recent work of Southwell (1981) showing that the Fresnel approximation is valid for points within the geometrically defined beam even very close to the diffracting object. By providing a physical explanation for this fact, the paper goes on to derive qualitatively the shape of the entire region in which the Fresnel approximation is valid.
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