How does the mirror know what's behind the paper. Explained!

The viral video explained. How can you see the object behind the paper. How does the mirror know it's there?

Part 2 - with more explanation here    • How does the mirror know what's there? Exp...  
Part 3 - How does a lake know the building is there?    • How does the lake reflect the building? Ho...  

Several people shared the original video with me and asked for an explanation. It's easily explained if you understand how light reflects off a mirror. In these videos, you'll notice that the observer or the phone is always positioned close to the mirror – that's the key to the trick.

This video explains more.

Original video from   / baileycaviness12  

https://www.sciencefix.co.uk/2023/04/...


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