When you take a picture of a computer screen using your phone, why do those waves on the screen move as you zoom in/out?
In: Technology
Not exactly sure I understand your question, but what you are seeing is probable a [moire](https://en.wikipedia.org/wiki/Moir%C3%A9_pattern). These occur when you overlay two grids that don’t perfectly line up. One grid is the computer monitor (consisting of square or rectangular pixels arranged into rows and columns) and the other grid is you camera’s digital sensor, which captures light falling on individual pixels arranged in a series of rows and columns. Since you can never perfectly line up your phone to your monitor and because they’re also going to be different resolutions (pixel size), you get a moire.
Your phones capture rate is about thirty to 120 frames captured per second, depending on how expensive. Your monitor displays 30-144 frames per second, because of the computer refreshing at different times than your phone can capture, it creates lines that jump up and down on the monitor.
Televisions are typically ~30, which is the default for most cameras. This is why you can record your TV better.
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