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According to several sources, momentum of a photon is $\dfrac{h}{\lambda}$.

While doing some reading on radiation pressure. I came across this wikipedia page where it was stated that "pressure due to reflected and emitted photons is identical."

radiation pressure in terms of photons

Why is that? Shouldn't reflected photons exert twice the pressure $2 \times \left( \dfrac{h}{\lambda A} \right)$, as compared to absorbed or emitted photons $1 \times \left( \dfrac{h}{\lambda A} \right)$ using simple conservation of momentum? Am I missing something here? Is the information on wikipedia correct?

From the same page, I found this helpful diagram contradicting the statement.

radiation pressure illustration

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  • $\begingroup$ It says the incoming photon causes the same pressure as the outgoing one. $\endgroup$
    – Stack Exchange Supports Israel
    Commented Jan 7, 2023 at 5:21

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I believe the article is stating that Classical Electrodynamics (EM waves) and Quantum Theory (photons) will both give "identical" results mathematically for the radiation pressure of either reflected or emitted light; not that the radiation pressure of reflected and emitted light is identical.

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