The transverse Fresnel-Fizeau light drag in the presence of a nondispersive homogeneous optical medium in uniform rectilinear motion is explained by using a simple Huygens' construction. As a consequence of the motion of the medium, the wavefront of every individual secondary wavelet is an ellipse partially dragged by the moving medium. The resulting formula agrees with the experiment by Jones in the early 1970s and with Fresnel's formula for transverse light drag. (C) 2004 American Association of Physics Teachers.
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