Quantum Mechanics Explains Refraction of Light Through Glass

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    Quantum Refraction
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Discussion Overview

The discussion centers around the quantum mechanical explanation for the refraction of light through glass, specifically addressing why higher frequency light refracts more than lower frequency light. The scope includes theoretical considerations and conceptual clarifications related to quantum mechanics and optics.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions the lack of explanation regarding why higher frequency light refracts more than lower frequency light.
  • Another participant suggests that the refractive index varies for different wavelengths, leading to different velocities of light in various media, which affects the angles of refraction as described by Snell's law.
  • A different viewpoint introduces the idea that photons take multiple paths and that their interference is influenced by their energy and frequency.
  • One participant expresses a desire to learn more about quantum mechanics to better understand the topic.
  • A suggestion is made to refer to the Feynman QED lectures for further insight.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as multiple perspectives on the explanation of refraction and the role of frequency are presented without resolution.

Contextual Notes

Participants reference concepts such as the refractive index and Snell's law, but there may be underlying assumptions about the nature of light and quantum mechanics that are not fully explored.

Zak
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There have been many posts requesting a quantum mechanical explanation for the refraction of light through glass, but none of them (as far as I'm aware) explain why higher frequency light refracts more than lower frequency. Can anybody explain why?
 
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It's probably because the refractive index of the substance is different for different wavelengths of light since the velocity of light is going to be different in separate mediums. It is safe to assume that violet light will be faster in a medium than red light will be in the same medium. If we then look at Snell's law, \displaystyle\frac{\sin(\theta_1)} {\sin(\theta_2)} = \frac{v_1} {v_2} = \frac{n_2} {n_1} It is easy to notice that a small change in v_1 or v_2 will noticeably affect the angles.

The change in the speed of each frequency is due to the material that it's traveling through, and how it vibrates the material.
 
You might consider how the photon takes many different paths and how these paths interfere with each other based on their relative phase angle. These will be related to the energy and frequency of the photon.
 
Ah, I think then I will have to learn more about Quantum Mechanics to really even appreciate the question. Thanks
 
The Feynman QED lectures might help you gain insight.

http://youtube.com/watch?v=LPDP_8X5Hug
 

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