Partial Reflection: Explaining Glass & Thickness Effects

pmerrill
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Was recently re-reading QED and wondered whether there was any "simple" explination of partial reflection? How does the thickness of glass affect reflection if it's a particle?
 
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Actually, nobody knows the answer to this one. For a basic exposition, I would highly recommend that you read "QED-The Strange theory of light and Matter by R.P Feynman".

The stuff you learn about matching up boundary conditions to retrace the path of the reflected and refracted rays (Classical Electrodynamics approach) does not answer the question why? It gives the answer, but not at the fundamental level.
 
Yeh, I've read QED, very good treatment, not enough math for me to really understand things. Odd that a problem that is so simple to demonstrate, and known about since Newton's time, has yet to be solved. Maybe it's Fermats last theorem for physicists?
 
Not an expert in QM. AFAIK, Schrödinger's equation is quite different from the classical wave equation. The former is an equation for the dynamics of the state of a (quantum?) system, the latter is an equation for the dynamics of a (classical) degree of freedom. As a matter of fact, Schrödinger's equation is first order in time derivatives, while the classical wave equation is second order. But, AFAIK, Schrödinger's equation is a wave equation; only its interpretation makes it non-classical...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
Is it possible, and fruitful, to use certain conceptual and technical tools from effective field theory (coarse-graining/integrating-out, power-counting, matching, RG) to think about the relationship between the fundamental (quantum) and the emergent (classical), both to account for the quasi-autonomy of the classical level and to quantify residual quantum corrections? By “emergent,” I mean the following: after integrating out fast/irrelevant quantum degrees of freedom (high-energy modes...
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