Lagrangian Optics by V. Lakshminarayanan, Ajoy Ghatak, K. Thyagarajan.
Ingeometrical optics, light propagation is analyzed in terms of light rays which define the path of propagation of light energy in the limitofthe optical wavelength tending to zero. Many features oflight propagation can be analyzed in terms ofrays,ofcourse, subtle effects near foci, caustics or turn...
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