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 https://youtu.be/aNUpGDgW44A
Part 3 – How does a lake know the building is there? https://youtu.be/ggXnkEeYu1o
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.
https://www.sciencefix.co.uk/2023/04/how-does-the-mirror-know-whats-behind-the-paper-explained/
Note: It always bugged me when i originally uploaded this video I meant it as a short, and I messed up the video settings… so it’s vertical, but as a widescreen video – so bits get cut off the frame and it looks rubbish. So here it is in a widescreen format – with all the graphics intact!