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Answering viewer questions about refraction Answering viewer questions about refraction 14 min Wallace Wallace 6 min The Awful Origins of "Sweet FA" | Fascinating Horror Shorts The Awful Origins of "Sweet FA" | Fascinating Horror Shorts 1 min I Investigated India’s Biggest Smartphone Controversy I Investigated India’s Biggest Smartphone Controversy 42 min Samsung S26 Ultra Review - Breaking Point. Samsung S26 Ultra Review - Breaking Point. 17 min LORN - UPSIDE DOWN COPS LORN - UPSIDE DOWN COPS 4 min Antigravity A1: A New Take on Drones! Antigravity A1: A New Take on Drones! 11 min The Sketchiness in GREECE The Sketchiness in GREECE 26 min Distracted By The Scenery? The 1986 Grand Canyon Crash | Fascinating Horror Distracted By The Scenery? 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Answering viewer questions about refraction

2023 14 min

Why bending, how can light go "faster" than light, and more Lessons are primarily funded directly by viewers, who get early access to new videos: https://3b1b.co/support An equally valuable form of support is to simply share the videos. Much of the last video, as well as this one, is based on the following Feynman Lecture: https://www.feynmanlectures.caltech.edu/I_31.html Looking Glass Universe videos on the refractive index: https://youtu.be/uo3ds0FVpXs?si=Q12Rgz9vN1JMo_di Timestamps: 0:00 - Why slowing implies bending 3:36 - Recap for how slowing happens 5:08 - Birefringence 6:19 - The barber pole 8:20 - When the refractive index is less than 1 Thanks to these viewers for their contributions to translations French: LE PRAT Ronan, PyStL Hebrew: Omer Tuchfeld Portuguese: rose ✨ Russian: iverid ------------------ These animations are largely made using a custom Python library, manim. See the FAQ comments here: https://3b1b.co/faq#manim https://github.com/3b1b/manim https://github.com/ManimCommunity/manim/ All code for specific videos is visible here: https://github.com/3b1b/videos/ The music is by Vincent Rubinetti. https://www.vincentrubinetti.com https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown https://open.spotify.com/album/1dVyjwS8FBqXhRunaG5W5u ------------------ 3blue1brown is a channel about animating math, in all senses of the word animate. If you're reading the bottom of a video description, I'm guessing you're more interested than the average viewer in lessons here. It would mean a lot to me if you chose to stay up to date on new ones, either by subscribing here on YouTube or otherwise following on whichever platform below you check most regularly. Mailing list: https://3blue1brown.substack.com Twitter: https://twitter.com/3blue1brown Instagram: https://www.instagram.com/3blue1brown Reddit: https://www.reddit.com/r/3blue1brown Facebook: https://www.facebook.com/3blue1brown Patreon: https://patreon.com/3blue1brown Website: https://www.3blue1brown.com testing an addition

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