Here's Why Squishing Light Makes It Bigger

It's Heisenberg's uncertainty principle at its best.
Loukia Papadopoulos

YouTuber The Action Lab always brings us the best experimental videos where he takes complex subject matter and explains it in a way that we can all understand. Such is the case with his Bernoulli's principle video and the hourglass buoyancy problem.

In this video, the YouTuber seeks to explain Heisenberg's uncertainty principle using a wrench, two razor blades, and a laser pointer. This experiment also explains why squishing light makes it become bigger.

To do this, he sticks two razer blades at the end of a wrench so he can control how much light goes through them. He starts by having the blades very far apart. Then, he illustrates how as he closes the razor blades the light spreads out more and more.

Is it the Heisenberg uncertainty principle at play here or just a principle of diffraction of light? What is happening to the intensity of the light? How does the particle nature of light play into the experiment? How does the uncertainty principle play here? The Action Lab answers all these questions and more in his captivating and interesting video.

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