An optical glass containing boric oxide, along with silica and other ingredients, having relatively high ?-value and low index of refraction. Some varieties, such as Corning Pyrex® and Schott Tempax®, are resistant to thermal shock, as a result of their low coefficient of expansion.
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.