First at all beams or rays doesn't exist, it only are abstract geometric constructions that allow you in an easy way how and where images are formed in mirros (planar or curved) and lenses (virtual or real images).
In geometric optics any point emitis infineite rays in all infinite directions. If you know the path of two particular rays the point where it intersects all other rays will intersect too forming the image point, real or virtual and virtual is also an abstraction.
Rays are only tools, real light is much more complicated because light can be a particle (photon) or a wave and you have to apply Newton's or Huyghens theory of light depending on the case and it doen't matter if you use a laser or a torch, you must use both theories. With lasers the wave nature of light becomes more evident.
The Huyghens principle states that any point of the wavefront that hits a point of an object turns into a wave emiter.
It is more easier to uses photons than try to reconstruct wavefronts, but in many cases is not possible.
People that speaks about Quantics speak on photons, but forget or ignore that Qunatics itself is a wave theory, photons only apply when you deal with particles, real or an abstraction to make our lives easier.
Einstein's Relativity theory is an particle theory where all wave and electromagnetic theory is ignored.

Stupidity also evolves!