Abstract
In this chapter we will briefly recapitulate the fundamentals of the ray optical method which requires an approximate description of the wave field on the basis of ray representations. Assigning a mathematical ray with the Fresnel volume converts it into a physical object. The concept of Fresnel’s volume yields a versatile criterion of applicability of the ray theory to be derived. It defines caustic zones as regions where rays cease to be physically distinctive. In the shadow region, ordinary geometrical optics gives way to its complex counterpart.
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Kravtsov, Y.A., Orlov, Y.I. (1993). Rays and Caustics. In: Caustics, Catastrophes and Wave Fields. Springer Series on Wave Phenomena, vol 15. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-97491-5_2
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DOI: https://doi.org/10.1007/978-3-642-97491-5_2
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