I-1 Light: Wave or Particle

I-1   LIGHT: WAVE or PARTICLE?                                                                                                                                                                          

  What IS s light? PARTICLE or WAVE?  

          The role of light in the development of science and technology

          Light as a particle (Newton);

          Light as a wave (Huygens); light is an electromagnetic wave (Maxwell); 

          The principle of relativity (Einstein; blackbody radiation (Planck's hypothesis of quantized energy); 

          The photoelectric effect (Einstein); 

          Quantum electrodynamics (Feynman)

          Parametric down conversion (it propelled experiments on quantum entanglement.)