ELI5: Explain Like I'm 5

Extinction ratio

Okay kiddo, so have you ever seen a rainbow? You know how there are lots of different colors in a rainbow, right? Well, imagine if you had a special pair of glasses that could only let one color through at a time.

Now, imagine you have a flashlight that shines all the colors of the rainbow at the same time. If you shine that flashlight through your glasses, only one color would come through. That's because the glasses have something called an "extinction ratio", which means they can block out all the colors except for one.

Now, let's apply that to something else. In science, we use something called a polarizer to block out certain types of light. It's kind of like those glasses, but for science experiments. The extinction ratio of a polarizer tells us how well it can block out certain types of light. The higher the extinction ratio, the better the polarizer is at blocking out unwanted light.

So, extinction ratio is basically a fancy term for how well a polarizer can block out certain types of light. Just like your rainbow glasses can only let one color through at a time, a polarizer can only let certain types of light through based on its extinction ratio.