紫外线是德国化学家里特在1801年发现的.他在光谱的紫光区域外侧放置了一张照相底片,结果底片感光,于是紫外线就被发现了.紫外线有何作用呢?紫外线的一个显著特征是荧光作用强.在钞票的某些位置用荧光物质印有标记,当用紫外线照射时,这些荧光物质能够发光,所以我们可以利用紫外线来检验钞票.紫外线的生理作用也很强,能杀菌.在医院的手术室、病房里,常用紫外线灯来灭菌.紫外线还有助于人体合成维生素D, UV was discovered by the German chemist Ritter in 1801. He placed a photographic film outside the violet region of the spectrum, exposing the film to light and UV light was found.What is the role of UV? A notable feature of UV is fluorescence The role of strong.Under the banknote in some places marked with fluorescent substances, when irradiated with ultraviolet light, these fluorescent substances can light, so we can use UV to check the banknotes.UV also has a strong physiological role, can sterilization .In the hospital Of the operating room, ward, commonly used UV lamp to sterilize.Ultraviolet rays also help the human body to synthesize vitamin D,