| 单词 | light | 
| 释义 | light [līt]  OPTICS 1. Electromagnetic radiation with wavelengths capable of causing the sensation of vision, ranging approximately from 4000 (extreme violet) to 7700 angstroms (extreme red). Also known as light radiation; visible radiation.  2. More generally, electromagnetic radiation of any wavelength; thus, the term is sometimes applied to infrared and ultraviolet radiation.  | 
	
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