| sphere |
Elementary or para-elementary world. cf : Description drown from the introduction of the Encyclopedia Globorum Vegetalum et Animorum.
출처: phylene.com/glossaire/index.html.en
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| spherical aberration |
when light strikes a spherical mirror, not all the wavelengths come to a focus at exactly the same point. This can create coloured 'halos' around objects being observed. In Newtonian Reflectors, this is alleviated by making the mirror elliptical. In Maksutov-Cassegrain telescopes and Schmidt-Cassegrain telescopes, a specially configured correcting plate corrects the light path.
출처: www.sctaas.com.au/Definitions.htm
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