• word of the day

    principal axis

    principal axis - Dictionary definition and meaning for word principal axis

    (noun) a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
    Synonyms : optic axis
    Example Sentence
    • in a normal eye the optic axis is the direction in which objects are seen most distinctly

Word used in video below:
text: the principal valid and the principal
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