古时候罗马人和希腊人发现一个奇特的现象：装水的玻璃球可以使物体放大。但当时人们认为这是水的作用，而不明白这是凸透镜的功劳。有一个卖蔬菜的商人利用这一现象装饰橱窗，使水果看起来格外醒目。古罗马的一位哲学家在公元６０年时写道：盛水的玻璃烧瓶可以放大字体．据记? In ancient times the Romans and Greeks discovered a peculiar phenomenon: water glass globe can make the object magnified. But at that time, people thought it was the role of water, but did not understand that this is the contribution of convex lens. There is a businessman selling vegetables to use this phenomenon decorative window, so that the fruit looks particularly eye-catching. A philosopher in ancient Rome wrote in AD 60: A glass flask filled with water can enlarge the font. According to remember?