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Not wishing to provoke any peer-pressure, I'll abjure that tag,
In optics, when a ray of light changes media its frequency is said to be
unaffected, but its wavelength is changed to reflect the change in velocity
in the new medium and /nu = /lambda * f.
Why is frequency unchanged and wavelength changed? ... I told my
students I would pose this question to my peers. So here it is.
Dan M