meridional ray
(optics) A ray that passes through the axis of the optical fiber.
(rare) Alternative form of multistriate
visual awareness without perception (typically, only being able to see something properly when it moves)
(grammar) The present tense in the indicative mood.
光学試験では、光ファイバーの軸を通る光線は、軸外の光線より偏差が小さいことを示しました。
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