Rotating cylinder puts a new spin on slow light
In 1859 the French physicist Hippolyte Fizeau demonstrated this “photon drag” in the longitudinal direction by shining light through flowing water. More than 100 years later, in 1976, the British physicist Reginald Jones demonstrated it similarly in the transverse direction, by shining light near the edge of a spinning glass disc. But until now, it seems, no-one has ever shown that an image formed by light can be rotated. The problem is that the atoms are so quick to re-emit absorbed photons that the change in an image’s rotation is barely perceptible.
via Zapperz
By virtue of spatial effect of electromagnetic wave dragging by a rotating medium the wave vector trajectory differs from straight line.
In order words, secondary electromagnetic waves change direction in each local region of the trajectory because of a change in the projection of the velocity of the atoms of the medium onto the wave vector of the excitation wave. As a result, there is a drift of the phase velocity, and there is curvature of the trajectory representing the superposition of all waves.
To describe the effect of distortion of the trajectory of an electromagnetic wave in rotating optical disk it is needed to use the solution of the dispersion equation of moving medium optics for the spatial case of medium motion.
If you don’t registered the distortion of the light the electrodynamics is wrong?