Topography technique that involves positioning a grating close to an object and observing its shadow on the object through the grating. The resultant moire fringes correspond to a contour line system of the object under certain conditions.
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.