Questions About QED: The Strange Theory of Light and Matter

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Feynman claims right at the beginning of the book that light is made of particles. But the fact is, light is both wave and particle, that's a proven dual nature of light called "The Raman Effect". I don't understand why he claims that light is only particles?

Andrew Polito Of course Feynman was aware of the dual nature of light. Feynman builds up his explanation of QED one step at a time, and tries to take the reader thr…moreOf course Feynman was aware of the dual nature of light. Feynman builds up his explanation of QED one step at a time, and tries to take the reader through layers of questions that science had to answer to arrive at our current understanding of quantum mechanics. (Or more precisely, the understanding that was current when the book was published.) Some simplifications, like describing photos as particles reflecting off the "surfaces" of glass are discarded in later sections once he given the reader sufficient tools to discuss the deeper concepts more accurately.(less)

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How much physics background is required to understand this book?

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