[T]his rule explains several of the ordinary phenomena... such as angle of incidence equals angle of reflection, and refraction, that light bends... from air to water, and travels in straight lines... It's all hidden in that one rule.

— Richard Feynman, Photons: Corpuscles of Light (1979)

Source: https://www.youtube.com/watch?v=8InwJnkDHjE&t=47m41s

Part 1 of the 1979 Sir Douglas Robb Lectures, University of Auckland.

Topics: physics