# ELI5 One Way Mirrors - how do they work?

Page: https://stenobird.com/podcast/eli5-explain-like-i-m-5-bite-sized-answers-to-stuff-you-should-know-about-in-a-mini-podcast-484092/eli5-one-way-mirrors-how-do-they-work
Text version: https://stenobird.com/podcast/eli5-explain-like-i-m-5-bite-sized-answers-to-stuff-you-should-know-about-in-a-mini-podcast-484092/eli5-one-way-mirrors-how-do-they-work.md
Podcast: [ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast](https://stenobird.com/podcast/eli5-explain-like-i-m-5-bite-sized-answers-to-stuff-you-should-know-about-in-a-mini-podcast-484092)
Published: 2026-02-20T06:00:00+00:00
Episode link: https://prefix.up.audio/s/pscrb.fm/rss/p/op3.dev/e/traffic.megaphone.fm/ATHLLC7529197439.mp3
Audio file: https://prefix.up.audio/s/pscrb.fm/rss/p/op3.dev/e/traffic.megaphone.fm/ATHLLC7529197439.mp3
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JSON: https://stenobird.com/v1/public/podcasts/eli5-explain-like-i-m-5-bite-sized-answers-to-stuff-you-should-know-about-in-a-mini-podcast-484092/episodes/eli5-one-way-mirrors-how-do-they-work
Duration seconds: 449

## Resource

How do one way mirrors allow light to pass in only one direction? If light travels through the glass equally from both sides, why does the simple flip of a light switch create a hidden observer? How does a microscopic layer of aluminum or silver on a piece of glass actually bounce light back to create a reflection? Why does our brain instantly prefer our flipped mirror image over the real perspective captured in a photograph? ... we explain like I'm five Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: avalancheofneed, afropuf, coolminded, tequilaamocking_bird, blade_torlock, imtrollin_theyhatin, antiproton and spilgrim16 To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter: https://www.twitter.com/eli5ThePodcast/ or send us an e-mail: ELI5ThePodcast@gmail.com

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## Transcript

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