What is a mirror ( reflective surface and back) made out of?
metal, or a metal coated polymer
http://www.wisegeek.com/how-are-mirrors-made.htm
thanks!
A mirror, typically used to reflect the image of objects, is made out of a sheet of glass or acrylic that has been coated with a thin layer of metal, typically aluminum or silver, on its back surface. The metal coating reflects light, creating a clear and accurate reflection of objects in front of it. The metal coating is applied to the glass or acrylic using a process called "silvering" or "aluminizing."
To further explain how this is done, the process of creating a mirror involves several steps. First, the glass or acrylic sheet is carefully cleaned and prepared to ensure a smooth surface. Next, a thin layer of metal is deposited onto the back surface using a technique such as vacuum deposition or sputtering. These methods involve evaporating or coating the metal atoms onto the surface in a controlled environment. The metal coating must be very thin to allow light to pass through the glass and then reflect off the metal layer. Finally, a protective layer, often made of paint or varnish, is applied to the metal coating for added durability and to prevent it from getting scratched.
Overall, the combination of a glass or acrylic substrate and a metal coating is what makes up a mirror, allowing it to reflect light and create a clear reflection.