Light velocity, wavelength, and frequency

AI Thread Summary
When light travels between two media, its frequency remains constant while its velocity and wavelength change due to differing indices of refraction. The relationship between these properties is inversely proportional, ensuring that frequency stays the same. This constancy is crucial for maintaining continuity in the electric and magnetic fields at the boundary between the two media. The discussion confirms that the unchanged frequency is essential for this continuity. Understanding these principles is vital for grasping the behavior of light in various 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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