In reply to your statements:
Quote:
Originally Posted by renormalised
No, you chose one reply which was not based on anything to do with your initial and subsequent inquiries. ...
My initial reply to your question was correct and is as correct as Bojan's.
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My question was
how can the "redshift" of a single photon be measured? So Bojan's response was the only relevant one and had everything to do with my initial and subsequent inquiries.
Your reply and Bojan's can't both be correct.
Redshift is measured from a spectrum. A single photon is not a spectrum of photons.