Understanding the Speed and Behavior of Light in Different Mediums

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    Light Speed
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SUMMARY

The discussion centers on the behavior of light as it transitions between different mediums, specifically its speed changes when entering and exiting denser materials. Participants clarify that light slows down in a medium due to interactions with atoms, which cause it to take a longer, zigzag path, but it resumes its original speed, c, upon exiting. This phenomenon does not violate Newton's laws as the light's average speed is affected by its interactions, not by an external force. The analogy of a car stopping at traffic lights effectively illustrates this concept.

PREREQUISITES
  • Understanding of basic optics principles, including refraction and light speed.
  • Familiarity with the concept of photons and their behavior in different mediums.
  • Knowledge of Newtonian physics and its application to light behavior.
  • Basic grasp of electromagnetic theory and momentum conservation.
NEXT STEPS
  • Research the principles of refraction and Snell's Law in optics.
  • Explore the concept of photon interactions with matter in various mediums.
  • Study the implications of light speed on momentum and energy transfer in physics.
  • Investigate the differences in light behavior in gases versus solids and liquids.
USEFUL FOR

Students of physics, educators in optics, and anyone interested in the fundamental principles of light behavior and its implications in various mediums.

  • #31
Hey Blacksheepdork

look what you started! the world is full of questions and answers! Boy does the physics teacher have a thing or two to learn also.
 
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  • #32
Actually, that's an interesting question, Integral.

I had been implicitly presuming the same thing; I was talking about how "easy" it is to reemit the energy in a particular direction, but kept tacit the law of large numbers which (kinda sorta) states that the net result is predominately the easiest one.


But... some of the interesting QM experiments seem to say otherwise. For instance, in the famous experiments involving half-silvered mirrors, photons are said to either be transmitted through the mirror, or to be perfectly reflected via incidence = reflection...


I guess (I think) it falls down to the fact that the photon is really the center of probability for a wave packet, so by definition it follows perfectly the expected behavior.

Hurkyl
 
  • #33
Well, in a vacuum a photon isn't following that random a path, right? Obviously, it's not following a simple angle of incidence, since it's actually a complex wavefunction, but each imaginary particle in the wavefunction I would expect reflects the way you expect it. That's how it seems to me anyway. Not that I wouldn't be interested in reading that book, but it doesn't feel to me like this entire thread is on shaky ground...'course that's me

Take care.
 

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