spherometer

A spherometer is a precision instrument used to measure the radius of curvature of spherical surfaces, such as lenses and curved glass. It typically consists of a three-legged base that rests on the surface and a central micrometer screw that measures the height difference between the surface and the base. The readings from the micrometer allow calculation of the curvature radius, aiding in quality control and optical testing. Spherometers are commonly used in laboratories, optics manufacturing, and physics experiments.