optic axis

noun — 2 senses

optic axis

noun

1

The optical axis.

[B]inocular creatures can in an instant […] move their eyes so as to direct the optick Axis to any point […].1665, Robert Hooke, Micrographia, section XXXIX:

2

Chemistry, Crystallography, Geography, Geology, Mineralogy, Natural sciences, Physical sciences The direction in which a ray of light passing through a crystal does not suffer double refraction.

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