Your phone makes all the colours it needs to be combining red, green and blue in different proportions.
It does so as follows: the screen is literally a panel of red, green and blue lights. These are so tiny and close together that the colours all run together and mix into the greys, yellows, purples, mauves, etc that you see.
The droplet of water acts like a tiny magnifying glass, letting you see the dots that are normally too small.
Your phone makes all the colours it needs to be combining red, green and blue in different proportions.
It does so as follows: the screen is literally a panel of red, green and blue lights. These are so tiny and close together that the colours all run together and mix into the greys, yellows, purples, mauves, etc that you see.
The droplet of water acts like a tiny magnifying glass, letting you see the dots that are normally too small.
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