Crystalline form of silicon dioxide; very hard with a low expansion coefficient. Transmits light through the range of 180nm (ultraviolet) to 4.5 micrometers (infrared).
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.