What reflects light the best?

Question

What reflects light the best?

Answer 1

smooth white things

Answer 2

our eyes

Answer 3

Material-wise, highly polished silver.

Answer 4

water and/or aluminum

Answer 5

mirrors

Answer 6

A mirror

Answer 7

A dielectric mirror.  

"A dielectric mirror is a type of a mirror composed of multiple thin layers of dielectric material, typically deposited on a substrate of glass or some other optical material. By careful choice of the type and thickness of the dielectric layers, one can design an optical coating with specified reflectivity at different wavelengths of light. Dielectric mirrors are also used to produce ultra-high reflectivity mirrors: values of 99.999% or better over a narrow range of wavelengths can be produced using special techniques."