Question about velocity change

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In a medium, the velocity of a light wave is slower than in a vacuum, leading to changes in wavelength while frequency remains constant. The relationship between speed, frequency, and wavelength is defined by the equation speed = frequency x wavelength. When light enters a medium, both speed and wavelength decrease, but frequency does not change. The confusion arises from the assumption that a decrease in wavelength would imply an increase in frequency, which is only true if speed remains constant. Therefore, in this scenario, only the wavelength changes as the light wave propagates through the medium.
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If the velocity of a light wave is less in a medium
than it is in vaccuum, does that mean.
• the wavelength is changing during propagation?
• the frequency is changing?
• both?
 
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The frequency does not change. The wavelength does.
 
LostConjugate said:
The frequency does not change. The wavelength does.

but how it can be .if you reduce wavelength your frequency becomes bigger.i do not see the logic.As fo me they both are changing.please argument
 
agentas said:
but how it can be .if you reduce wavelength your frequency becomes bigger.
Only if you keep the speed constant, which is not the case here. What is true, is that speed = freq X wavelength. Both speed and wavelength decrease.
 
frequency is proportional to the period
 

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