Qed (book)

QED: The Strange Theory of Light and Matter is an adaptation for the general reader of four lectures on quantum electrodynamics (QED) by Richard Feynman (1918-1988).

QED was designed to be a popular science book, written in a witty style, and containing just enough quantum-mechanical mathematics to allow the solving of very basic problems in quantum electrodynamics by an educated lay audience. It is unusual for a popular science book in the level of mathematical detail it goes into, actually allowing the reader to solve simple optics problems, as might be found in an actual textbook. But unlike in a typical textbook, the mathematics is taught in very simple terms, with no attempt to solve problems efficiently, use standard terminology, or facilitate further advancement in the field. The focus instead is on nurturing a basic conceptual understanding of what is really going on in such calculations. Complex numbers are taught, for instance, by asking the reader to imagine that there are tiny clocks attached to subatomic particles. The book was first published in 1985 by the Princeton University Press.

The book


Much of Feynman's discussion springs from an everyday phenomenon: the way any transparent sheet of glass partly reflects any light shining on it. Feynman also pays homage to Isaac Newton's struggles to come to terms with the nature of light.

Feynman's lectures were originally given as the Vega Science Trust.

The book is based on Feynman's delivery of the first Alix G. Mautner Memorial Lecture series for the general public at the University of California, Los Angeles (UCLA) in 1983. The differences between the book and the original Auckland lectures were discussed in June 1996 in the American Journal of Physics.

In 2006, Princeton University Press published a new edition with a new introduction by Anthony Zee. He introduces Feynman's peculiar take at explaining physics, and cites: "According to Feynman, to learn QED you have two choices: you can go through seven years of physics education or read this book".

The four lectures

1. Introduction
In the first lecture, Feynman describes the basic properties of photons which acts as a gentle lead-in to the subject (as he colloquially stated before that a science lecture is boring if either it's not using layman terms or saying something upside down). Feynman discusses how to measure the probability that a photon will reflect or transmit through a partially reflective piece of glass.
2. Photons: Particles of Light
In the second lecture, Feynman looks at the different paths a photon can take as it travels from one point to another and how this affects phenomena like reflection and diffraction.
3. Electrons and Their interactions
The third lecture describes Quantum phenomena such as the famous double-slit experiment and Werner Heisenberg's uncertainty principle, thus describing the transmission and reflection of photons. It also introduces his famous "Feynman diagrams" and how quantum electrodynamics describes the interactions of subatomic particles.
4. Loose Ends
In the fourth lecture, Feynman discusses the meaning of Quantum electrodynamics and some of its problems. He then describes "the rest of physics", giving a brief look at quantum chromodynamics, the weak interaction and gravity, and how they relate to quantum electrodynamics.


  • The Douglas Robb Memorial Lectures Video of the four public lectures in New Zealand of which the four chapters of this book QED: The Strange Theory of Light and Matter are transcripts.

External links

  • Feynman QED lectures in New Zealand - Vega Science Trust streaming video.
  • The Strange Theory of Light - Computer programs inspired by the Czech translation of this book.

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