对于地下商场来说,一般是没有能够投入阳光的窗户的,只有很多通风口与地面相通。这样,就需要白天黑夜地开着电灯来照明,于是就很费电。美国田纳西州橡树山脊国家实验室的科学家发明了把阳光引入室内的妙招,在白天,地下室完全可以用阳光来照明。其实这项技术是个老技术了,它利用了光在玻璃中容易发生全反射的原理。现在用玻璃光纤来传播光信号就是采用这个原理,能够把光信号传播到几百 For underground shopping malls, there is usually no window to sun, and only a few vents communicate with the ground. In this way, you need to turn on the lights to illuminate day and night, so it is very costly. Scientists at the Oak Ridge National Laboratory in Tennessee, USA, invented the coup d’etat to introduce sunlight into the interior. During the day, the basement can be illuminated with sunlight. In fact, this technology is an old technology, which takes advantage of the principle that light is prone to total reflection in glass. Optical fiber is now used to spread the optical signal is the use of this principle, the optical signal can be spread to hundreds