Mediums that only refract light

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Discussion Overview

The discussion centers on the existence of surfaces that only refract light, exploring the conditions under which this might occur and the underlying principles of refraction versus reflection. The scope includes conceptual clarification and technical reasoning related to optics.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants inquire whether surfaces exist that exclusively refract light without reflecting any, specifically in the context of visible light.
  • One participant clarifies that "only" refers to the process of refraction rather than the spectral range of light involved.
  • Another participant notes that for light to be refracted, there must be a change in optical impedance, which is characterized by the index of refraction, and mentions the Fresnel equations as relevant to understanding the behavior of light at interfaces.
  • It is proposed that if the index of refraction is continually changing, the eikonal equation could be applied to track the rays of light.
  • One participant emphasizes that the principles discussed apply to all types of waves, not just light.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of "only refract light" and whether such surfaces can exist, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

The discussion does not resolve the assumptions regarding the nature of surfaces that could refract light without reflecting it, nor does it clarify the specific conditions under which this might occur.

ghostfolk
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I know there exists surfaces that only reflect light (mirrors), but are there surfaces that only refract light? If so, how does that happen?
 
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ghostfolk said:
I know there exists surfaces that only reflect light (mirrors), but are there surfaces that only refract light? If so, how does that happen?

Welcome to the PF.

What do you mean by "light"? Do you mean just the visible EM spectrum? If so, a mirror reflects much more than just the visible spectrum of light.
 
Well I guess I'm referring to the visible range.
 
I think that his "only" refers to refraction and not to the spectral band (visible light).
A surface which will not reflect light at all so all incident light will be "refracted" into the second medium.
 
For light to be refracted (bending of rays) there must be a change in the optical impedance: the index of refraction. Then the Frenel equations describe how much of the light is refracted, and how much is reflected. If the index of refraction is continually changing the eikonal equation can be used to track the rays.

The same principles apply to all types of waves.
 

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