Describes the way a ray of light changes direction at a surface between two media that have different indices of refraction. The angle of incidence of the ray is measured from the normal, or perpendicular, to the surface. A ray moving from a low-index medium to a high-index medium bends toward the normal; from high-index to low, it bends away from the normal.
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.