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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.

Tropia (Strabismus)


- Point -

 Tropia - A definite deviation of the eye.



- Point Word-

  • Definite


- Explanation -

The tropia is the eye's return in one direction when viewed externally and can be clearly distinguished with the naked eye. The tropia has four directions: up, down, left, and right.

 The tropia is the eye's return in one direction when viewed externally and can be clearly distinguished with the naked eye. The tropia has four directions: up, down, left, and right.






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