The double-slit experiment is a 19th century investigation into the properties of light that has since been found to demonstrate the wave-particle duality of photons, electrons and other particle types as well as demonstrate other quantum properties, such as superposition and interference. Debate over whether light is made up of particles or waves dates back over three hundred years. In the 17th century, Isaac Newton proclaimed that light consists of a stream of particles. His view remained the

Science at Home: Light Refraction Experiment