ELI5 Why flash is seen on phone camera but not to a naked eye, when key of a remote control is pressed

Question

ELI5 Why flash is seen on phone camera but not to a naked eye, when key of a remote control is pressed

In: Physics

Answer 1

Cameras usually have the ability to see in the IR spectrum. It’s limited and it’s usually blanked out by the visible light spectrum, but a remote has a bright IR light inside.