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一、已知物距、像距例1 物体位于凸透镜前15cm处,在凸透镜后20cm的光屏上成一个清晰的像,确定这个凸透镜的焦距范围. 解析:根据凸透镜的成像规律,物体通过凸透镜在光屏上成的像一定是实像;又因为像距大于物距(vu),所以像一定是放大的.物体通过凸透镜
First, known object distance, image distance Example 1 The object is located 15cm in front of the convex lens. A clear image is formed on the 20cm behind the convex lens to determine the focal length of the convex lens. Analysis: According to the imaging law of the convex lens, the object passes through the convex lens. The image formed on the screen must be a real image; because the image distance is greater than the object distance (vu), the image must be enlarged. The object passes through the convex lens.