Phones use a special kind of light called infrared to see if you're looking at them. It’s like when you point a flashlight in the dark, your phone does the same thing, but with invisible light! When you look at the screen, it shines this light on your face and detects how much of it bounces back. If enough light comes back, the phone knows you’re looking at it, just like how we see things in the real world!
Examples
- Your phone turns on when you look at it because it shines invisible light on your face.
- You unlock your phone with your face using the same technology as a flashlight in the dark.
- The screen wakes up even in the middle of the night because it sees your face through invisible light.
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See also
- How Can a Single Computer Run So Many Apps at Once?
- How Can A Tiny Microchip Power Your Whole Phone?
- How Can a Computer Be Smarter Than You?
- How are humanoid robots advancing and setting new performance records?
- How Can A Single Button Change Your Whole Life?