English Dictionary

optic axis

noun

The optical axis. / (crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction.

The optic axis is the line along which light propagates through an optical system.

意味（1）

The optical axis.

[B]inocular creatures can in an instant […] move their eyes so as to direct the optick Axis to any point […].

意味（2）

(crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction.