Urdu Meanings, Pronounciation and Synonyms:
principal axis
(Pronunciation -تلفظ سنیۓ )
US: 
Slow
Normal
Noun: principal axis
| 1. principal axis [ Synonyms: optic axis] | |
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A line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
"in a normal eye the optic axis is the direction in which objects are seen most distinctly";
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