| 单词 | Littrow grating spectrograph |
| 释义 | Littrow grating spectrograph [`li´trō ¦grād·iŋ `spek·trǝ´graf] SPECTROSCOPY A spectrograph having a plane grating at an angle to the axis of the instrument, and a lens in front of the grating which both collimates and focuses the light. |
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