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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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Specific Gravity

 

- Point -

Specific Gravity refers to lens material weight by comparing equal volumes of the material and water.



- Point Word-

  • Specific Gravity
  • Water

  • Water density = 1.0



- Explanation -

Specific gravity = Relative density

A measure of the density of a substance in comparison to the density of water.

The ratio of the density of a substance of object to the density of water at 4 degrees Celsius.


Water is the standard (Water Specific gravity = 1.0)

Specific Gravity refers to lens material weight by comparing equal volumes of the material and water.

Relative density    <--  Wikipedia





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