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晶本来是指水晶,透明石英的一种,就是从前制眼镜用的材料,后来用做图章和光学器具。在化学上,晶就是指一切天然结出有定形的物体,不一定是透明的。现在我们所说的盐晶是各种盐所成的透明晶体,不一定是天然产。玻璃虽是透明,并不是晶体。科学仪器中用的棱镜和透镜向来是用玻璃做的,经过多年的研究,造出了光学玻璃,进步到登峯造极。但是无论怎样,总不免有缺点,就是玻璃对于波长的光——红外辐射,和短波的光——紫外辐射,不能完全的透过。
Crystal originally refers to the crystal, a kind of transparent quartz, is the material used in the previous system of glasses, and later used as stamps and optical instruments. In chemistry, crystal refers to all naturally shaped objects, not necessarily transparent. Now we are talking about the salt crystal is a transparent crystal made of various salts, not necessarily natural. Although the glass is transparent, not crystal. Prism and lens used in scientific instruments have always been made of glass. After many years of research, optical glass has been made and its progress has peaked. But no matter what, the total inevitably has the disadvantage that the glass for the wavelength of light - infrared radiation, and shortwave light - ultraviolet radiation, can not be completely through.