What determines how light is reflected

  • Context: Undergrad 
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Discussion Overview

The discussion revolves around the factors that determine how light is reflected or absorbed by surfaces, exploring both theoretical and conceptual aspects of light interaction with materials.

Discussion Character

  • Exploratory, Conceptual clarification

Main Points Raised

  • One participant questions what specific properties of a surface lead to the reflection or absorption of different wavelengths of light.
  • Another participant suggests that the presence of conduction electrons and the nature of phonon modes in the material are key factors influencing these properties.
  • A different viewpoint introduces the index of refraction as a relevant factor in determining light behavior at surfaces.
  • A subsequent post seeks clarification on the role of phonon modes, specifically asking whether the reflection of a particular color is related to phonon vibrations matching that color's frequency, and how this relates to absorption.

Areas of Agreement / Disagreement

Participants present multiple viewpoints regarding the factors influencing light reflection and absorption, indicating that the discussion remains unresolved with competing ideas on the topic.

Contextual Notes

There are unresolved questions regarding the specific mechanisms by which phonon modes affect light interaction, and the discussion does not clarify the relationship between these mechanisms and the observed optical properties.

Sea Cow
What is it exactly about a surface that makes it reflect or absorb some or all wavelengths of light?
 
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Sea Cow said:
What is it exactly about a surface that makes it reflect or absorb some or all wavelengths of light?

1. the presence of conduction electrons
2. the nature of the phonon modes in the material

Zz.
 
Alternatively, the index of refraction.
 
ZapperZ said:
1. the presence of conduction electrons
2. the nature of the phonon modes in the material

Zz.
Forgive me if I am being thick, but could you explain point 2. more? What is it about the phonon modes? For instance, if a surface just reflects a particular colour, is that because the phonon vibrates at the same frequency as that colour? If so, how does that stop the light from being absorbed?

Thankyou for your patience.
 

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