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.
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