To put an end to our investigation on the nature of light, we are going to take a quick look at one of the most important experiments in the history of physics: the two-slit experiment.
This experiment was first conceived by T. Young in 1801. It was thought to prove that light is a wave. However, at the beginning of the XXth century, with the arrival of Quantum Mechanics, the same experiment revealed that light (in fact, any kind of matter) is neither a particle nor a wave (or perhaps it is both of them at the same time!).
Please, watch the video you will find on this link and afterwards identify its main parts and its conclusion (the following link will help you understand the nature of 'quantum objects') .
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