he double-slit experiment is one of the more well-known experiments in physics history. First proposed by early 19th century physicist Thomas Young, this experiment is delightfully simple in its set-up, yet deceptively complex in what it tells us about the world.
While light can behave like a particle, the double-slit experiment was originally used by Young to show that light can also behave like a wave. If you need a refresher on the experiment, you can see a version here:
Read more: http://www.smithsonianmag.com/smart-news/what-if-theres-way-explain-quantum-physics-without-all-probabilistic-weirdness-180951914/#gr2Fik0auUJIjxkJ.99