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 ...

Rembrandt may have traced his celebrated self-portraits from optical projections created by assemblies of mirrors or lenses, a new analysis suggests. Two U.K.-based researchers -- Francis O'Neill, an ...

Transparent plastic optical lenses can be manufactured cheaply and in any shape. However, a downside is that they reflect light just as much as glass does. Researchers are exhibiting a new type of ...