Video Transcript
(1.1s) Hi, everyone. Did you know that TV remotes use invisible light to communicate with your television like this? Now, you might ask, how am I doing that? There's actually no tricks going on. This is just a regular TV remote. I have a few of them. But what's special is that the cameras that we use every day, so the camera that's on my laptop right now or the camera that's in your cell phone, can see more light than our eyes can see. This light is called infrared light or IR light for short. And the TV remotes or any remote really uses this infrared light to send a signal to your device. So because the camera can see more than our eyes can, when I push a button on the TV remote, you see a blinking light turn on. Well, that light is infrared light. It's light that we can't see, but the special camera can. Now, it doesn't work great on all cameras. On this laptop camera I'm using, it happens to be very, very good. But sometimes there are small filters put on our camera phones that limit us from seeing some of that light. So I'll show you here. It does work with your iPhone camera, for instance. You can see a very dim purple blinking. But it works really, really well with this laptop camera.
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