光こう軸じく

noun

optical axis (of a lens, spherical mirror, etc.)

In geometrical optics, the line passing through the center of curvature and the vertex of a lens or mirror.

• レンズの光こう軸じくを合あわせる。

  Align the optical axis of the lens.

noun

optic axis (of a crystal)

In crystal optics, the direction along which no birefringence occurs. Also called 光学軸.

See also: 光学軸

• 方ほう解かい石せきの光こう軸じく方ほう向こうでは複ふく屈くっ折せつが起おこらない。

  Birefringence does not occur along the optic axis of calcite.