生活中我们常用的照相机、投影仪、放大镜的镜头都是凸透镜,但为什么照相机成缩小的实像,投影仪成放大的实像,而放大镜则成放大的虚像呢?仔细观察他们的使用情况后不难发现,原来成像情况不同是因为物体到镜头的距离(物距)不同造成的.那么,不同的物距对成像情况有何影响呢?以焦距和二倍焦距为参照点,我们探究了凸透镜在不同物距下的成像 Our commonly used camera, projector, magnifying glass lenses are convex lens, but why the camera into a reduced real, the projector into an enlarged real, while magnifying glass into an enlarged virtual image? Careful observation of their use is not difficult We found that the original imaging situation is different because of the object to the lens distance (object distance) caused by different. So, the different object distance on the imaging situation? With focal length and double focal length as a reference point, we explore the convex lens in Imaging of different object distance