Newton's Rings are a pattern of concentric circular fringes observed when light is reflected between a thin air film and a glass surface. This phenomenon occurs when a plano-convex lens is placed on a flat glass plate, creating varying air gaps. The interference of light waves results in bright and dark rings, depending on the thickness of the air layer. The rings are named after Sir Isaac Newton, who studied them in the 17th century. They demonstrate the principles of interference and optics, showcasing how light behaves when it encounters different surfaces. Newton's Rings are often used in laboratories to measure the wavelength of light.