what exactly is light ray?
light comes in diferent forms,the spectrum,inforred and dead like black holes in the sky,when a star falls into itself the mass causis interference and light bends and splits
In classical optics, light is fundamentally understood as a electromagnetic wave. A ray of light is an approximation to Maxwell's equations. In most materials, the rays travel in straight lines and the density of rays in a region can be associated with the energy density of the light in that region. The link below goes into the rigorous treatment.
