Light velocity, wavelength, and frequency

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Discussion Overview

The discussion centers on the behavior of light as it travels between two media, specifically focusing on the changes in frequency, wavelength, and velocity due to differing indices of refraction. The scope includes conceptual understanding of wave properties in different media.

Discussion Character

  • Conceptual clarification

Main Points Raised

  • One participant asserts that the frequency of light remains constant while the velocity and wavelength change when transitioning between media with different indices of refraction.
  • Another participant agrees with the assertion that frequency remains the same.
  • A question is raised regarding the reason for frequency remaining constant, with a suggestion that it may relate to the continuity of the electric field at the boundary between media.
  • A subsequent response supports this idea, stating that the continuity of the electric and magnetic fields at the refractive boundary necessitates an unchanged frequency.

Areas of Agreement / Disagreement

There is agreement among some participants that frequency remains constant during the transition between media, but the reasoning behind this remains a point of inquiry.

Contextual Notes

The discussion does not address potential limitations or assumptions regarding the definitions of frequency, wavelength, and velocity in different media.

JDiorio
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Just a quick concept check.

I was asked that as light travels between two media, what happens to its frequency, wavelength and velocity.

I want to say that the frequency remains the same while the velocity and wavelength change, based on the difference of the index of refraction between the two media. But because frequency remains constant, their changes are indirectly proportional so that the frequency stays the same.

Am i right? Thanks
 
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You are right. Frequency remains the same.
 
Can I ask why? I've never known. Does this way keep the electric field continuous or something?
 
MikeyW said:
Does this way keep the electric field continuous or something?
Exactly. The only way for the electric and magnetic fields to be continuous at the refractive boundary is if the frequency is unchanged.
 

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