Photon: the light particle

This lecture explores the concept of the photon as a particle of light and electromagnetic radiation, introduced by Einstein in 1916. It delves into the photon's properties as an elementary particle, its mass, charge, and role as the force carrier of the electromagnetic force. The lecture also covers the photon's zero mass, zero charge, and integer spin, as well as its behavior as a wave and its radiative pressure effects. Additionally, it discusses photon duality, frequency, refraction, polarization, and interactions with matter, emphasizing the photon's significance as a fundamental entity in the Universe.