Have you heard about this?
Basically he demonstrates how light can be a wave and a particle. Enclosed is some background on the history of this question and how the double slit experiment came to be. And this relates to the lab experiment more recently where a photon changed course when someone viewed it and it is a repeatable experiment.
Light is so common that we rarely think about what it really is. But just over two hundred years ago, a groundbreaking experiment answered the question that had occupied physicists for centuries. Is light made up of waves or particles?
The experiment was conducted by Thomas Young and is known as Young’s Double Slit Experiment. This famous experiment is actually a simplification of a series of experiments on light conducted by Young. In a completely darkened room, Young allowed a thin beam of sunlight to pass through an aperture on his window and onto two narrow, closely spaced openings (the double slit). This sunlight then cast a shadow onto the wall behind the apparatus. Young found that the light diffracted as it passed through the slits, and then interfered with itself, created a series of light and dark spots. Since the sunlight consists of all colours of the rainbow, these colours were also visible in the projected spots. Young concluded that light consist of waves and not particles since only waves were known to diffract and interfere in exactly the manner that light did in his experiment.
Here is some more background on the history leading to this experiment.
Somehow they gained access to a vault in London where they gained access to Thomas Young’s hand written notes. They go on to shine light through two very narrow slits side by side and the viewers seem to see a bunch of dots when they look through the device. However when they go to a pond and take two balls creating outgoing overlapping ripples, they demonstrate how the waves gets amplified and can also cancel each other out.
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