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光信息之当代生活21世纪是信息化的时代,也是光学的时代。光所传递的信息无处不在,那么什么是光信息呢?你在使用双筒望远镜看演唱会的时候,你在用数码相机拍摄照片的时候,你在用DVD机看电影的时候,你就已经在不知不觉中和光信息打交道了。让我们看一下DVD机是如何播放视频的吧。当你按下DVD机上的“播放”键时,激光器发出的激光被聚焦到光盘上。光盘上有许多微小的凹槽,存储着各种信息。光盘一转动,凹槽就会反射激光,凹槽的深浅
The contemporary life of optical information The 21st century is the era of information and the era of optics. When the light passes the information everywhere, then what is the light information? When you use binoculars to watch a concert, when you take a picture with a digital camera, when you watch movies with a DVD player, you Has been unknowingly deal with optical information. Let’s take a look at how DVD players play videos. When you press the “Play” button on the DVD player, the laser light from the laser is focused on the disc. There are many tiny grooves on the disc, storing a variety of information. A disc rotation, the groove will reflect the laser, the depth of the groove