TIR (total internal reflection) in terms of quantum world

[Pritamstar]

how total internal reflection of light takes place in terms of quantum world?

 

[berkeman]

how total internal reflection of light takes place in terms of quantum world?

What are your thoughts on this? What is the context of your question? Is this for homework?

 

[Pritamstar]

its not homework, actually i was thinking when a light beam falls at the interface of a medium with angle more than critical it undergoes TIR But in quantum world the electrons present on the edge would absorb it then when they release it how do they know they have to release the photon in inward direction..

 

[blue_leaf77]

its not homework, actually i was thinking when a light beam falls at the interface of a medium with angle more than critical it undergoes TIR But in quantum world the electrons present on the edge would absorb it then when they release it how do they know they have to release the photon in inward direction..

The same as the other macroscopic EM phenomena such as reflection and refraction, you don't need to resort to quantum mechanics to explain them. The macroscopic effect of light propagation is determined by the phase condition of the various secondary sources across the beam path. In this case the atoms near the surface on which the light impinges.
Microscopically there shouldn't be any preferred direction to which the atoms emit photons. Individually, each atoms emit with the same probability in any direction. However, depending on how synchronized they were at the time of interaction with the incoming light (i.e. the incident angle), the net effect is that the emitted light has certain directionality. Also, the EM field beyond the surface in the case of TIR does not completely vanish, a certain amount can still penetrate up to some depth which is called the evanescent wave.