system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: When two mirrors face each other, where does the light eventually "go" so that it doesn't constantly build up?

Also, is there an eventual limit for how many recurrences of the other mirror are in the reflection?
gpt
Mirrors reflect light out at the same angle it came in at. To trap light indefinitely, you'd need light coming in at one mirror at a perfectly straight angle wit h the two mirrors facing eachother perfectly - and then be able to remove the device fast enough (keep in mind we're talking about light) for the light to not hit the light emitting device after it bounces off the first mirror)

Everything else would bounce around a few times and eventually away.