High School Understanding Reflection in Light: Electromagnetic Interactions with Matter

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Light interacts with normal matter through electromagnetic interactions, leading to phenomena such as translucency or absorption due to quantization. Reflection occurs when light encounters a surface, involving complex interactions that may include phase changes and internal reflections. The discussion references Feynman's "QED: The Strange Theory of Light and Matter" for deeper insights into these concepts. There is skepticism regarding the notion that matter is merely composed of space, suggesting a more complex understanding of matter's structure. Overall, the conversation emphasizes the intricate relationship between light and matter in the context of electromagnetic theory.
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If light encounters -normal- matter, the electromagnetic aspects of the influence of the electrons will be interacted with (I'm ignoring any stress contributuins to gravity) which is (scattering matrix?) either nothing at all (translucency) due to quantisation, or absorbtion.

Is this correct?

If so, how is it that light be reflected?
 
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_PJ_ said:
If so, how is it that light be reflected?
You might want to give Feynman's book "QED: the strange theory of light and matter" a try.
 
Yrs i have that book, unfortunately, it's in storage, and I've not seen an english-language version here. Sadly I am unable to memorise entire chapters I had read over ten years ago.
 
I do recall passages and diagrams concerning internal reflections and the phase-changes as result but the details are fuzzy now. Also, I seem to recall diagrams where light was an oscillating line and matter had a ' surface' marked by a continuous, thin line...

I am unconvinced that matter is composed of space thus bounded.
 
Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?

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