Three of the greatest Physical scientists ever known, Isaac Newton, Thomas Young and Albert Einstein were much distracted by the question
‘What exactly is light’. Newton rhetorically asks ‘Are not the rays of light very small bodies emitting from shining substances ?’ He had essentially
developed a corpuscular or particle theory of light, coming to this conclusion partly from the observation that light is split into two beams by
certain transparent crystals. Some 100 years later Thomas Young, undertook his famous experiment ‘Young’s double slit’, regarded as perhaps the simplest and one of the most convincing proofs of the wave character of light. Another century goes by before Albert Einstein,
in explaining the photoelectric effect, introduces the essence of a quantum (particle) theory of light. But who is actually correct? All are. Light illustrates the extraordinary wave-particle duality of the Universe. Newton, Young and Einstein were all right to some measure. This demonstration lecture will explore some aspects of this key question - ‘What is Light?’
Please register for this talk here.