Anti-Reflection Coating 1

An antireflective, antiglare or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses, other optical elements, and photovoltaic cells to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost due to reflection. In complex systems such as cameras, binoculars, telescopes, and microscopes 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. An anti-reflection coating (AR coating) is a dielectric thin-film coating (eg:- Magnesium Fluoride and Cryolite) applied to an optical surface in order to reduce the reflectance (also often called reflectivity) of that surface due to Fresnel reflections.