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2000年初二物理竞赛卷第五大题2小题:在图中画出入射光线经凸透镜折射后的光线. 解法一,平行光法一.利用凸透镜能使平行光会聚于一点的性质,作出两条过左焦点和光心且与入射光线平行的特殊光线,找出它们折射后会聚的点F′,再连接折射点和F′,即折射光线,如图2.解法二,平行光法二.根据光路可逆性,设平行光从右侧照来,仍作过焦点和光心的平行
The second issue of the second year of the 2000 Physics Competition Vol.2: In the figure, the incident light is refracted by the lenticular lens. Solution 1. Parallel light method 1. Using the convex lens to make the parallel light converge to a point, make two The special rays that pass through the left focus and the optical center and are parallel to the incident light, find the point F′ where they condense after refraction, and then connect the refraction point and F′, that is, the refracted rays, as shown in Fig. 2. Solution 2, parallel light method II. According to the reversibility of the optical path, the parallel light is taken from the right side, and the center of focus and the center of light are still parallel.