二百八十年前,荷蘭有一个市政府的看門人列文赫克,用玻璃制成了世界上第一架显微鏡。列文赫克用这架显微鏡从一滴水中发现了一个当时人們还不知道的世界——微生物世界。在这个世界里活动着的生物非常的小,一般只有一厘米的几万分之一長短,几百万个这样的生物排列起來,才有一寸長、普通肉眼是看不見它们的。这是显微鏡第一次在人們面前显示出了它的偉大作用。一、眼睛和視觉为什么微小的东西眼睛看不見呢?主要是由于视角的缘故。一切东西都是由于从它上面發射出来光綫,进入我們眼里才被看見的,当我们观察一个物体的时候,从物体兩端射到眼睛里来的兩条光线所成的角,就叫做“視 Two hundred and eighty years ago, there was a city government keeper, Leven Heck, who made the world’s first microscope with glass. Leeuwenhoek used the microscope to discover a world in which the people did not know at the time - the microbial world. The living creatures in this world are very small, generally only a few centimeters long and one-thousandths of a centimeter, and millions of such creatures line up. They are one inch long and cannot be seen by the naked eye. This is the first time that the microscope has shown its great role in front of people. First, eyes and vision Why are tiny things invisible to the eye? This is mainly due to the perspective. Everything is caused by the light emitted from it and it is seen in our eyes. When we look at an object, the angle formed by the two rays of light that shoot from the ends of the object into the eyes is called "View