All optical components are bound by the combination of plane and curved surfaces. Due to ease of fabrication, the curved surfaces are spherical, though nonspherical and free-form surfaces are gaining importance in some sophisticated designs. The curved surfaces provide power to the optical component. The spherical surfaces need to be produced with tight tolerances on the surface curvature. The measurement of radius of curvature and focal length of lenses and mirrors is a very important activity in the production environment. It is the range, and the accuracy and precision required that make these measurements often very complicated. In most of the cases, the measurement ...
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