optic axis | (n) in a doubly refracting crystal, the line in the direction of which no double refraction occurs |
principal axis | (n) a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted, Syn. optic axis |
optic axis | (n) in a doubly refracting crystal, the line in the direction of which no double refraction occurs |
principal axis | (n) a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted, Syn. optic axis |