optic axis   (TTS Sound)

The optic_axis has 2 Senses.

• optic axis
• 光学軸
• in a doubly refracting crystal, the line in the direction of which no double refraction occurs; "a crystal may have either one or two optic axes"
• 複屈折結晶、線の向きに複屈折が全く起こらない

• optic axis, principal axis
• 光学軸, 主軸
• 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"
• 光が反射も屈折もしない、湾曲したレンズの中心を通る直線