Anti-reflection coating. Anti-reflection (AR) coatings on a modern camera lens minimizes reflections for light incident onto a lens. AR coatings typically consist of several thin layers of glass with different refractive index. Layer thicknesses are designed to produce destructive interference for the reflected light. Hence the reflectivity depends on the wavelength and the angle of incidence. For reflections outside of the angle of view of the lens, characteristic interference fringes appear.