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Antireflective glass speaks to what is antireflective glass and why use antireflective glass.
It is the type of glass that minimizes residual reflections that normally occur when light levels differ significantly on the opposite sides of glass.
It is used for glazing in showrooms, display areas, sports stadiums, artwork framing and other applications where the highest possible optical quality is desired. Mirrors are made of mirror which has a thin silver based coating on its back side. A thin layer of copper applied over the silver prevents corrosion and a second layer of backing paint provides additional protection.
An antireflective or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses and other optical devices to reduce reflection. This improves the efficiency of the system since less light is lost. In complex systems such as a telescope, the reduction in reflections also improves the contrast of the image by elimination of stray light.
This is especially important in planetary astronomy. In other applications, the primary benefit is the elimination of the reflection itself, such as a coating on eyeglass lenses that makes the eyes of the wearer more visible to others, or a coating to reduce the glint from a covert viewer's binoculars or telescopic sight.
Many coatings consist of transparent thin film structures with alternating layers of contrasting refractive index. Layer thicknesses are chosen to produce destructive interference in the beams reflected from the interfaces, and constructive interference in the corresponding transmitted beams.
This makes the structure's performance change with wavelength and incident angle, so that color effects often appear at oblique angles. A wavelength range must be specified when designing or ordering such coatings, but good performance can often be achieved for a relatively wide range of frequencies: usually a choice of IR, visible, or UV is offered.
Interference-based coatings were invented in November 1935 by Alexander Smakula who was working for the Carl Zeiss optics company. Anti-reflection coatings were a German military secret until the early stages of World War II. Katharine Burr Blodgett and Irving Langmuir developed organic anti-reflection coatings in the late 1930s.