# Why wavelength of light changes while its frequancy remains the same in refraction?

by maizaz
Tags: frequency, light, refraction, wavelenth
 P: 3 When light or any other electromagnetic wave enters from one medium to another, there is a change in its speed. Speed of a wave is given as v = frequency x wavelength. My question is, what does change, frequency, wavelength or both? If you say..... this change in speed is generally attributed to change in wavelength. then again my question is, why the medium discriminates between wavelength and frequency of the incoming wave?
 P: 452 The medium only determines the speed of the wave it does not destroy any portion of the wave nor does it generate anything.The information is conserved.Imagine you have two connected wires with different densities. If you send mechanical pulse you will see that the speed and length change as it passes from one wire to the other but the pulse will not disappear or be split into multiple pulses.
P: 3
 Quote by bp_psy The medium only determines the speed of the wave it does not destroy any portion of the wave nor does it generate anything.The information is conserved.Imagine you have two connected wires with different densities. If you send mechanical pulse you will see that the speed and length change as it passes from one wire to the other but the pulse will not disappear or be split into multiple pulses.
Well and good bp_psy, but i want to know why we always say that wavelength changes and frequancy remains the same as the speed of the wave (it will be better consider light waves) took a different value upon refraction.

 Sci Advisor P: 1,477 Why wavelength of light changes while its frequancy remains the same in refraction? Nature requires that the phase of an EM wave must remain continuous across a boundary. In order for the phase to be continuous for all time the frequency must be constant. Therefore, it is the wavelength that must change upon a change in velocity. Claude.