what changes; Frequency or Wavelength when light passes from a rarer to a denser medium?And Why?
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See http://physics.stackexchange.com/a/226842/24774 – fffred Feb 28 '16 at 09:21
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@fffred The answer you linked doesn't explain why the frequency remains constant. I think that should be explained. – DanielSank Feb 28 '16 at 09:24
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Well, this one gives an answer even if it is not very detailed http://physics.stackexchange.com/a/21338/24774 – fffred Feb 28 '16 at 09:31
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Frequency is controlled by the source of the light, not the medium that the light is passing through. – David White Feb 28 '16 at 14:07
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Which one allows the boundary conditions to be maintained at the interface? – The Photon Feb 28 '16 at 16:04