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夏日骄阳似火,给人们带来很多问题,比如防晒问题,这对于爱美人士和特殊人群尤其重要。本文就日光带来的美容和疾病问题做一简单介绍。1.日光普照大地,沐浴万物,为何会对人们有害?日光根据波长的不同可分为紫外线、可见光及红外线等。首先,最短的为紫外线,不同波长的紫外线生物效应不同。波长180~290nm称短波紫外线(UVC),
Summer sun, it brings many problems to people, such as sun, which is particularly important for the beauty and the special crowd. This article gives a brief introduction to the beauty and disease caused by sunlight. 1. Daylight shines on the earth, bath all things, why is harmful to people? According to the wavelength of sunlight can be divided into different types of UV, visible light and infrared. First of all, the shortest for the UV, different wavelengths of biological effects of UV different. Wavelength 180 ~ 290nm shortwave ultraviolet (UVC),