In the modern day, mirrors are just about everywhere. But that wasn't always the case, and the mirror actually has a ...

This is one of very few Roman mirrors of this type known from anywhere in the Roman Empire. A slave would have held the mirror by the ornate handles so that the lady could view her face in the ...

With this sextant, one of the mirrors ( mirror A in the diagram) is half-silvered, which allows some light to pass through. In navigating, you look at the horizon through this mirror. The other ...

By contrast, an open-cavity laser has a gas-discharge tube sealed with the fully silvered mirror on one end and a Brewster window on the other, which is a very flat piece of glass set at a steep ...