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A spherometer is an instrument used for the precise measurement of the radius of curvature of a curved surface. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens .
Lens clock. A lens clock is a mechanical dial indicator that is used to measure the dioptric power of a lens.It is a specialized version of a spherometer.A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.
Visualization of the sagitta. In geometry, the sagitta (sometimes abbreviated as sag [1]) of a circular arc is the distance from the midpoint of the arc to the midpoint of its chord. [2]
Deep blue ray refers the radius of curvature and the red line segment is the sagitta of the curve (black).. In optics and especially telescope making, sagitta or sag is a measure of the glass removed to yield an optical curve.
It employed around 1,300 people in six factories in the late 1940s. It was situated on Camberwell Road in Camberwell, near the junction with the B214, between Walworth (to the north) and Camberwell (to the south) on the western edge of Burgess Park, now part of the London Borough of Southwark. There was a factory in Highbury, together with the ...
Many measurement devices outside this section may be used or at least become part of an identification process. For identification and content concerning chemical substances, see also Analytical chemistry , List of chemical analysis methods , and List of materials analysis methods .
In optics, spherical aberration (SA) is a type of aberration found in optical systems that have elements with spherical surfaces.This phenomenon commonly affects lenses and curved mirrors, as these components are often shaped in a spherical manner for ease of manufacturing.
Two types of radius gauges. A radius gauge, also known as a fillet gauge, [1] is a tool used to measure the radius of an object. [2]Radius gauges require a bright light behind the object to be measured.
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