Physics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspsa.345..351j&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 345, Issue 1642, pp. 351-364
Physics
9
Scientific paper
A previous measurement of the Fresnel "aether drag" in a transversely moving medium (Jones 1972) has been repeated with improved accuracy to find whether the original Fresnel formula should be modified by a dispersion term as was shown by Lorentz and Zeeman for the longitudinal drag. A formula derived by M.A. Player and by G.L. Rogers gives the transverse displacement of a beam of light passing through a medium of thickness t moving with transverse velocity \upsilon as \upsilon t(ng - nφ-1)/c rather than \upsilon t(ng - nφ-1)/c as given by the original Fresnel formula, where nφ is the phase refractive index and ng is the 'group refractive index.' The present experiment gives results in accordance with the Player-Rogers formula rather than with the Fresnel formula or one in which the group refractive index alone is involved; it parallels what Zeeman found for the longitudinal case. The main improvement in experimental accuracy has come from recognition of errors in the method of calibration by optical micrometry.
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