Dielectric Coated Mirror, Width 80 mm x Height 120 mm, Thickness: 10 mm

Dielectric mirror, is a type of mirror composed of multiple thin layers of dielectric material, typically deposited on a substrate of glass or some other optical material.
Material of Substrate Bk7
Clear Aperture > 90%
Angle of incidence 45 deg
Radius of curvature Infinity

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