| 单词 | spherical aberration |
| 释义 | > as lemmasspherical aberration d. spherical aberration: the failure of a spherical mirror or lens to cause rays of light to converge at a single point (as is effected by a parabolic mirror or lens).The distance of any ray from the geometrical focus, when measured along the axis, is its longitudinal aberration, and when measured at right angles to the axis, its lateral aberration. ΚΠ 1868 J. N. Lockyer Elem. Lessons Astron. 217 If such an achromatic lens be truly made, and its curves properly regulated, it is said to have its spherical aberration corrected as well as its chromatic one, and the image of a star will form a nearly colourless point at its focus. < as lemmas |
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