One of those very nice results that could have been found 100 years ago or more

One correction to the above article. At the end they reference 'gravity waves.' They clearly mean 'gravitational waves,' which do not have anything to do, directly, with the apparent force of gravity, but are changes in lengths and times that vary as the wave passes. Gravity waves, on the other hand, are waves on an ocean, for instance, where two fluids are in contact and the interface oscillates up and down

ya kidding right? which charges are affected, i.e. is the container a restraint? Which locations have less restraint. Juz saying. Though we did this when we calculated a Gaussian Beam Moving through and Inhomogeneous Media. I did that for my BS in EE, jus say'n Shoulda went to T.

BTW Wouldn't the mean path of light rays depend on the shape of vessel too? Try to imagine the passing of light through flat cuvette - every scattering would prolonge the mean path of light through it..

Every scattering? Imagine a scattering that occurs at the front of the cuvette that sends the light backwards, i.e. the light hardly enters before it bounces back out whence it came. That single counter-example falsifies your statement. In fact, the relative ratio of scatterings that are ~90 degrees to the initial path and hence liable to keep the photon in the cuvette are small compared to all the possible scattering angles.