Reply To: A Christmas Photonic Teaser

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#614688
Dr Paul Leyland
Participant

The photons hit a receptor in the retina (not the nerve directly). They are absorbed and their energy causes a chemical reaction. A long chain of subsequent reactions eventually reach the brain.

The photoreceptor is slowly (hence a long time taken for dark-adaption) returned to its initial chemical state, with the photon’s energy ultimately converted into heat.

An explanation in terms of QED would not be illuminating!