You can project all sorts of colors from a video projector, but can you project the color black? Wouldn’t that be like shooting a shadow out of a flashlight? I mean think about it. When you give a presentation, you can have a slide with a black background. How does that work? Well, guess what? There’s some fun physics here, so let’s get into it.
How Do We See the Color Black?
I like to ask students some questions about how they see things. The first is the most fun: Have you ever been in total darkness? I mean no light source at all, not even from a crack under the