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paraxial vergence equations

English translation: paraxial = close to the axis; veregence = convergence (of rays)

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06:07 Jun 26, 2005

English to English translations [PRO]
Medical - Medical: Instruments / IMPLANTABLE CONTACT LENS

English term or phrase: paraxial vergence equations

paraxial vergence equations

TIA!!!

Jianming Sun KudoZ activity Questions: 2118 (none open) (12 closed without grading) Answers: 1172
Local time: 19:53

English translation:paraxial = close to the axis; veregence = convergence (of rays)

Explanation:
paraxial = close to the axis
vergence = convergence

This link will give you more technical info about the term you have posted:

The equations to determine the position of an image are derived here. To achieve this, an assumption known as the paraxial approximation is made. Rays incident on a mirror are assumed to do so at only a small angle to the normal. This gives sin q ~ q. The assumption is mostly good as objects are usually a much larger distance away from the mirror than the diameter of the mirror.

http://www.physics.uq.edu.au/people/mcintyre/vergences/optic...

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Note added at 17 mins (2005-06-26 06:25:21 GMT)
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On reading the link above further I come to the conclusion that vergence is a more general term which encompasses both convergence and divergence. Convergence is indicated by a positive sign and divergence by a negative sign.

Selected response from:

Balasubramaniam L.
India
Local time: 17:23

Grading comment

Thank you all for kind help!
4 KudoZ points were awarded for this answer

Summary of answers provided

4 +5

paraxial = close to the axis; veregence = convergence (of rays)

Balasubramaniam L.

Deflection of the rays from the original axis upon passing through the lens

Drunya

3 -1

...

Allesklar

Discussion entries: 3

Answers

6 mins confidence:

peer agreement (net): -1

...

Explanation:
paraxial: Characteristic of optical analyses that are limited to infinitesimally small apertures. Also called first-order or Gaussian optics.
vergence: The angular relation between two light rays that originated at the same object point. Sometimes used to indicate the angle between the visual axes of the eyes.
equation = calculation

Reference: http://www.photonics.com/dictionary/lookup/XQ/ASP/url.lookup...

Allesklar
Australia
Local time: 21:23
Native speaker of:

German

9 mins confidence:

peer agreement (net): +5

paraxial = close to the axis; veregence = convergence (of rays)

Balasubramaniam L.
India
Local time: 17:23
Works in field
Native speaker of:

Hindi
PRO pts in category: 11

Grading comment

Thank you all for kind help!

9 hrs confidence:

Deflection of the rays from the original axis upon passing through the lens

Explanation:
If your context deals with equations, I am alsmost sure the vergence in question is not the pattern of eye movements, but the property of the lens itself.

Actually, in optics, the proper name for this parameter is vergency. Somehow, in ophthalmology, vergence prevailed, and you can now even find "vergence formulas", that is equations showing relations between vergence and other bsic optical parameters.

Compare, for instance, this Internet extract:

=====
Vergence (Power) of the lens:
The power or vergence V of a lens is the ***reciprocal of its focal length***
=====

With this dictionary definition:

"Vergency,..***the reciprocal of the focal distance***, being the measure of the degree of divergence or convergence of a pencil of rays." (Oxford English Dictionary)

So vergence is basically the optical power of the lens. Paraxial, I think, refers to the original axis of the beam of light, from which the light rays deflect upon passing through the lens.

Drunya
Native speaker of:

Russian
PRO pts in category: 8

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Changes made by editors

Jun 26, 2005 - Changes made by Jianming Sun:
Language pair	English to Chinese => English
Jun 26, 2005 - Changes made by Yvonne Becker:
Language pair	English => English to Chinese

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paraxial vergence equations

English translation: paraxial = close to the axis; veregence = convergence (of rays)

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paraxial vergence equations

English translation: paraxial = close to the axis; veregence = convergence (of rays)

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