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Dispersion = Abbe Number or Constringency Value and Nu Value

- Point -  Dispersion is categorized by Abbe Number or as it is also known by Constringency Value or Nu Value. - Point Word- Dispersion Abbe Number Constringency Value Nu Value - Explanation -  Dispersion refers to the state in which light is scattered or spread out. It refers to the separation of the constituent colors of light, like a rainbow.  Abbe Number is an optical property that describes how much a transparent material scatters light. It is a measure of chromatic dispersion. A higher Abbe Number indicates less dispersion and less chromatic aberration.
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Mechanical Center and Geometric Center and Optical Center.


- Point -


Mechanical Center and Geometric Center and Optical Center 3


Mechanical Center : The central dot of a lens cut and machined to fit the eyeglass frame.


Geometric Center : Central dot of a circular lens before processing.


Optical Center : The central point in a lens where light is not refracted.




- Point Word-


Mechanical Center : "Edged"


Geometric Center : "Lens before machining"


Optical Center : "Through which a ray of light may pass without being deviated."




- Explanation -


Mechanical Center and Geometric Center and Optical Center 1




Mechanical Center and Geometric Center and Optical Center 2



Mechanical Center = Point around which a lens is cut and edged. (The center of the block)


Geometric Center = The single point at the intersection of the diagonals in the boxed shape.


Optical Center = Single point on a spectacle lens through which a ray of light may pass without being deviated.



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