---
title: "Discussion on \"Why are there moving lights at the bottom of swimming pools? Here comes the Transport of Intensity effect.\" | Hashnode"
description: "Discussion on \"Why are there moving lights at the bottom of swimming pools? Here comes the Transport of Intensity effect.\". Have ever noticed this typical network of bright-and-dark areas on the bottom of a swimming pool? This is a physical phenomenon that has many applications."
url: "https://hashnode.com/posts/transport-of-intensity-effect/62c6fdb5353b847f29e892a3"
---

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# [Why are there moving lights at the bottom of swimming pools? Here comes the Transport of Intensity effect.](https://feldaher.hashnode.dev/transport-of-intensity-effect?utm_source=hashnode&utm_medium=feed)

Have ever noticed this typical network of bright-and-dark areas on the bottom of a swimming pool? This is a physical phenomenon that has many applications.

Jul 7, 2022 · 6 min read · feldaher.hashnode.dev  
Updated Jun 23, 2023  
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-   [#physics](https://hashnode.com/tag/physics)
-   [#light](https://hashnode.com/tag/light)

## Written by

[Francois El-Daher](https://hashnode.com/@feldaher)

@feldaher · Edinburgh, Scotland - UK

  
[View profile](https://hashnode.com/@feldaher)

Writes about science, engineering, tech stuffs

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