我国是一个自行车大国,人们对于自行车,包括自行车后轮护罩上的尾灯,是再熟悉不过了。尽管如此,我们仍有必要回顾一下尾灯的历史。20世纪30年代,自行车刚刚在英国兴起时,车上都没有尾灯装置,因此交通事故频频。在这种混乱状况下,英国政府不得不出面干涉,要求在自行车上加装醒目的、能发射灯光的器具。物理学家设计的“无源直角反射器”,在众多反光器具中脱颖而出。它无须用电,而且 China is a large bicycle country. People are familiar with bicycles, including taillights on the rear wheel covers of bicycles. Despite this, we still need to review the history of taillights. In the 1930s, when bicycles were first raised in the United Kingdom, there were no taillights on the vehicle, so frequent traffic accidents occurred. In this chaotic situation, the British government had to intervene and demanded that bicycles be equipped with striking devices that could emit light. Physicists designed “passive right-angle reflectors” to stand out among many reflectors. It does not need electricity, and