Ever wonder how a mirror works? If you want to find the path that light takes when reflecting off a surface, you could use Fermat's Principle. This states something like this: The path that light ...

Infinite mirrors are a fun party trick, but the physics behind this phenomenon explains why it may not be true. When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

If you shine a light at a mirror, the beam is reflected inward to a central focal point, bouncing back toward you in a predictable manner—it’s a simple reflection of light, a spatial inversion. When a ...