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用放大镜看自己的指纹,再用放大镜看窗外的物体,放大镜是否总是把物体放大?通过实验可以看出,放大镜成放大、正立的虚像时,放大镜离物体比较近.当用放大镜看窗外的物体时,由于距物体较远,成倒立、缩小的实像.通过上节课的学习我们已经知道,照相机和投影仪都成倒立的实像,所不同的是,物体离照相机的镜头比较远,成缩小的像;物体离投影仪的镜头比较近,成放大的像.可见,像的虚实、大小、正倒跟物体到凸透镜的距离(物距)有关.
Magnifying glass to see their own fingerprints, and then use the magnifying glass to see the object outside the window, the magnifying glass is always the object magnification? Can be seen through the experiment, the magnifying glass into an enlarged, standing virtual image, the magnifying glass is closer to the object. Of the objects, as far away from the object, into the inverted, reduced real image. Through the last lesson we already know that the camera and projector are upside down real, the difference is that the object is far from the camera lens, Into a reduced image; objects closer to the projector lens, into an enlarged image. Can be seen, like the actual situation, size, is up with the object to the convex lens distance (object distance).