How prisms work (video linked above shows why light "slows down") @3blue1brown

3Blue1Brown | How prisms work (video linked above shows why light "slows down") @3blue1brown | Uploaded 10 months ago | Updated 11 minutes ago
A link to the full video is at the bottom of the screen.
Or, for reference: youtu.be/KTzGBJPuJwM

There, I wanted to dig deeper to understand light slows down, and why this would depend on the color.

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