The Feynman Lectures on Physics is a 1964 physics textbook by Richard P. Feynman, Robert B. Leighton and Matthew Sands, based upon the lectures given by Feynman to undergraduate students at the California Institute of Technology (Caltech) in 1961–1963. It includes lectures on mathematics, electromagnetism, Newtonian physics, quantum physics, and the relation of physics to other sciences.The first volume focuses on mechanics, radiation, and heat.The second volume is mainly on electromagnetism and matter.The third volume, on quantum mechanics, shows, for example, how the double-slit experiment contains the essential features of quantum mechanics.