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有一道初中考试题是:凸透镜的焦距为 f,烛焰到凸透镜的距离为 u.凸透镜到光屏的距离为 v 时,在光屏上可得到清晰倒立缩小的像,下列关系式正确的是:
There is a junior high school exam title: the focal length of the convex lens is f, and the distance from the candle flame to the convex lens is u. When the distance from the convex lens to the light screen is v, the image can be clearly inverted and reduced on the light screen. The following relationship is correct: :