ELI5: Explain Like I'm 5

Nipkow disk

The Nipkow disk is like a special wheel that has a lot of tiny holes on it, kind of like Swiss cheese. When you look at it, it looks a little bit like a round spider web! Each of those tiny holes is like a little window.

When you want to watch something on a TV using the Nipkow disk, you start by shining a light through the first hole on the disk. Then, that light goes through the first hole and onto the object you want to see, like a picture or a movie.

Now, here comes the really cool part! The object you want to see has different colors and brightness, right? Well, when the light goes through the first hole and hits the object, it reflects the colors and brightness onto the disk.

You know what happens next? The disk starts spinning really fast! As it spins, the light that went through the first hole jumps to the second hole, then the third hole, and so on. But each time it jumps to a new hole, it goes through a different part of the object.

So what does that mean? It means that as the light keeps jumping to different holes, it takes little tiny pictures of the object at each hole. These tiny pictures are all put together into one big picture on the TV screen, and that's what you see!

It's like a puzzle! The Nipkow disk takes all the different parts of the object and makes them fit together perfectly on the TV screen, so you can see the whole picture or movie. And it happens super fast, so it looks like you're watching it in real time!

That's the magic of the Nipkow disk. It helps us see things on a TV by using lots of little holes to take pictures really quickly and put them all together for us to watch. Pretty amazing, right?