  We present a new derivation of the Fresnel-Fizeau formula for the drag of
light by a moving medium using a simple perturbation approach. We focus
particulary on the physical origin of the phenomenon and we show that it is
very similar to the Doppler-Fizeau effect. We prove that this effect is, in its
essential part, independent of the theory of relativity. The possibility of
applications in other domains of physics is considered.
