A piece of glass with one or both surfaces polished flat. Also known as a test plate, test glass or reference flat. Optical Interference. The interaction of two light waves on the total intensity of light.
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.