I don't know why light slows down in water

Supported by Screen Australia and Youtube through the Skip Ahead initiative. Links to the other videos mentioned: Part 1 of this story:    • Does light actually slow down in water?   3Blue1Brown's explanation of Feynman's proof:    • But why would light "slow down"? | Visuali...   Experiment: If you’d like to try the experiment I did at home then you’ll need a phone with Lidar or you can get a laser meter quite cheaply at a hardware store. If you use an iphone, the app I found most reliable for the measurement was this one: https://apps.apple.com/us/app/lidar-m... Code: The 3D simulation is here: https://github.com/mithuna-y/speed_of... References: The Feynman lectures- “Ch 31: On the origin of refractive index” and “Ch 48: Beats”