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利用凸透镜的光学性质和成像规律,可以解决许多光学难题,下面跟同学们作一个详细梳理.一、利用凸透镜对光线的会聚作用解题例1如图1,正午时,太阳光直射在水平地面上,取一圆形薄凸透镜正对阳光,在距透镜15 cm的地面上得到一个光斑,其直径是透镜直径的一半,若将透镜向上移动少许,光斑变大,则透镜的焦距是()
The use of convex lens of the optical properties and imaging laws, you can solve many optical problems, following a detailed arrangement with the students.First, the use of convex lens convergence effect of light Solution Example 1 As shown in Figure 1, at noon, the sun shines on the ground Take a circular thin convex lens facing the sun, get a spot on the ground 15 cm away from the lens, its diameter is half the diameter of the lens, if the lens moves up a little, the spot becomes larger, the focal length of the lens is ()