ELI5 If you look at a dark phone screen you can choose whether you see what’s happening on the screen or you can use the screen as a mirror. How does that work?

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ELI5 If you look at a dark phone screen you can choose whether you see what’s happening on the screen or you can use the screen as a mirror. How does that work?

In: Biology

Focus. You’re either focusing your eyes on the screen itself and the light emitted from the screen, or you’re focusing on a separate light source, i.e., the reflection.

You can accomplish something similar on a larger scale as well. When you are in a car and its raining you can focus through the rain and see out or you can focus on the rain drops hitting the window and lose focus of whats beyond them.