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The interaction of
light and matter
Photons in a transparent material and the propagation velocity is less
than the speed in a vacuum. For example, photons generated by the kernel
in the sun reaching the surface of the sun in the distance to go
through numerous collisions, the time required to reach the surface up
to a million years [39], once the radiation into space in just 8.3
minutes you can reach the earth. Based on classical electromagnetic
theory of wave optics of this explanation is that the electric field of
light waves caused by the material within the electronic polarization,
polarization field and the original optical field caused by the
interference wave delays occur, this effect is manifested at the macro
on the geometrical optics The refractive index; while the perspective
from the light quantum, this process can be described as a photon in the
excited state of the material particles (quasi-particles, such as
phonons or elicitor) mixed into a polarization child, the child has a
non-zero effective polarization quality, which means that it can not
achieve the velocity of light. For different frequencies of light, the
velocity in the material may be different, this phenomenon is called
dispersion.
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