New theory about the nature of light!
Scientists Suggest Light Momentum Carried By Atomic Shock Wave by Peter Clarke
Finnish scientists have shed some light on 100 year-old paradox that there have been two different values for the momentum of light in a transparent medium and that typically, these values differ by a factor of ten.
The paradox that light has momentum but does not have mass is another matter.
Researchers from Aalto University have published a paper in Physics Review A that claims to show that the propagation of light in a transparent medium is associated with the transfer of atomic mass density. The passage of the photon through the medium sets the atoms in motion and a propagation wave of those atoms carries a significant part of the total momentum of the light. In the case of silicon this atomic wave carries 92 percent of the total momentum of light.