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题目给你一把刻度尺，请你测出老花镜的度数．老花镜是凸透镜，老花镜的度数等于它的焦距的倒数乘以１００．显然，测量老花镜的度数关键是测出老花镜的焦距．具体测法是：（１）晴天把老花镜片放在太阳光下，使太阳光线与老花镜片垂直．（２）调整老花镜片与地面的距离，使地
The subject gives you a scale, please measure the degree of reading glasses. Reading glasses is a convex lens. The reading glasses reading is equal to the reciprocal of its focal length multiplied by 100. Obviously, the key to measuring the reading glasses reading is to measure the focal length of the reading glasses. The specific measurement method is: (1) Sunny days put the old flower lens under the sun, so that the sun rays are perpendicular to the old flower lens. (2) Adjust the distance between the old lens and the ground to make it