Let us say we have a very long glass that has a uniform square cross section. Its long axis is aligned with the x axis. A beam of light is directed along the y axis such that it is normal to the side of the glass rod's side surface. When the rod is stationary wrt to the observer we would expect the beam of light to pass straight through the rod and hit a target on the other side without any deflection. Now it seems to me that if the rod is moving relativistically in the positive x direction that the beam of light would be deflected in the positive x direction and no longer hit the target. The deflection would be a function of the relative speed of the rod to the observer. Agree or disagree? There is probably an equation for this somewhere. Anyone know of one?