Last week I told my problems by placing a mirror. As a fragile material would not hurt to develop a good enough plastic to replace glass. But the most curious development being the use of liquids such as mirrors, telescopes both large and small lenses in a phone.
A backwater lake or a river were long the only mirrors. A layer of quiet and smooth liquid served to reflect the images. It is therefore not surprising that since Isaac Newton
, was thought to use liquids to replace lenses, much more expensive, delicate and difficult to polish. The ideal candidate was mercury, a liquid metal, easy to use and with good optical properties. Although, in contrast, is quite toxic . The next step was to focus images properly. The solution was to put the mercury in a flat container and turn it. The combined forces of gravity and the rotation curve slightly the mercury surface giving a parabolic shape. But to reduce the amount of mercury and used plastic discs are used in a dish with a thin layer of mercury at the top.
"Advantages? Cost only about 1% of a conventional mirror. And they are much lighter and cheaper. Even adding the cost of the other responsible for turning the mirror. In fact, there are already plans to build large telescopes on the Moon
using this technology. On Earth using telescopes six meters for special applications . 
One drawback, it must be said can only be directed from above, ie vertically upwards. This greatly limits the objects that can be observed and the time to do because the spin of the Earth away from the telescope of any chosen target.
I wonder if anyone will have thought of using electrically charged liquid and electric fields to change that orientation. Because something like this behind a new design of liquid lenses for cameras and mobile phones. The company Varioptic
designed a lens containing two liquids of a contact surface changes shape by applying an electric field. After a couple of years of development seems to have finally achieved a sufficiently advanced product for use in real models . Philips has also developed a similar technology . 
is interesting that even common elements such as mirrors can be changed with a little technology. A technology that reminds us of the world's oldest mirror.
Category: Physical
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