Things become visible due to

For things to be visible there are two factors. First is when an object reacts with its surroundings. An example of this would you cannot see a black colour cat at night but it becomes visible when the background is white.
The second factor is visible light. There is a set of a band of lights that are detected by the human eye. When these lights are detected by the eye, it gets converted into wavelengths that are understood by our brain.

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