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References
For example, J. Liouville, J. Math.pures appl. 2, 16 (1837).
It is also natural to ask what is the momentum of a photon passing through a medium of index of refraction n. But since the field is continually in interaction with the medium, only the total momentum of field and medium is significant, and the attribution of part of it to the light is to some extent arbitrary. See J.A. Arnaud, Am. J. Phys. 42, 71 (1974).
The idea of group velocity goes back to W. R. Hamilton, Proc. Roy. Irish Acad. 1, 267, 349 (1839). For a careful discussion see Brillouin 1960.
Snell's discovery was anticipated by Thomas Hariot, probably before 1618. See J.W.Shirley, Am. J. of Phys. 19, 507 (1951).
Phil. Trans. Roy. Soc. 1834 11, 247; 1835 I, 95.
Texas Mauretanian Eclipse Team, Astron. J. 81, 452 (1976); B.F. Jones, Astron. J. 81, 455 (1976). A comparison of earlier measurements is given by S.Weinberg (1972), p. 193.
E.B.Fomalont and R.A.Sramek, Phys. Rev. Letters 36, 1475 (1976).
J.Soldner, Berliner Astron. Jahrb. 1804, 161 (1801). See also Ann. Physik 65, 593 (1920).
J.D.Anderson et al., Astrophys. J. 200, 221 (1975).
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(1979). Rays of light. In: Classical Dynamics and Its Quantum Analogues. Lecture Notes in Physics, vol 110. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0021206
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DOI: https://doi.org/10.1007/BFb0021206
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