Have you ever sat on the bottom of a swimming pool and pondered your watery ceiling? Most of the surface is a sheet of light blue, and you can't see through it, even though the water is clear. But ...

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 ...

Antireflective coatings are applied to many optical materials, from everyday glasses to imaging instrumentation, to help the surface absorb light so that it doesn’t interfere with the user. In this ...