Interference bands, such as Newton’s Rings, which are formed when light is reflected from two adjacent polished surfaces, placed together with an air space between them. Used to determine the fit of a lens surface to a test glass.
SPHERICAL VS. ASPHERIC LENSES
HOW THEY’RE USED IN IMAGING APPLICATIONS
Optical Lenses are often categorized by their shape. Two common surface shapes are spherical and aspherical. Each offers unique characteristics that make it suitable for different use cases.