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1993年高考物理试题27题是一道透过凸透镜观看方格的问题,原题如下: 某人透过焦距为10厘米、直径为4.0厘米的薄凸透镜观看方格纸,每个方格的边长均为0.30厘米。他使透镜的主轴与方格纸垂直,透镜与纸面相距10厘米,眼睛位于透镜主轴上离透镜5.0厘米处,向他至多能看到同行上几个完整的方格? 不少考生对此题束手无策,甚至认为问题是无解的,因为放在焦点处的物体并不能通过凸透镜成象,物体发出的光通过透镜折射后是平行光,也有的中学教师对此提出质疑,认为透过凸透镜观看焦点处物体的象的问题已超出了中学物理范围,该题是超纲的。那么,究竟能否观看到方格?问题是否超纲?该题
The 1993 physics examination paper question 27 is a question of viewing squares through a convex lens. The original question is as follows: A person looks at square paper with a thin convex lens with a focal length of 10 cm and a diameter of 4.0 cm, and the side length of each square. Both are 0.30 cm. He makes the main axis of the lens perpendicular to the square paper, the lens is 10 centimeters away from the paper surface, and the eye is located 5.0 centimeters from the lens on the lens spindle. Can he see at most a few complete squares on the peer? There is no solution to the problem, and even the problem is solvable because the object placed at the focal point cannot be imaged by the convex lens. The light emitted by the object is collimated after being refracted by the lens. Some secondary school teachers questioned that this is through the convex lens. The problem of viewing objects in focus is beyond the physical scope of secondary schools. So, can we really see the square? Is the question superclass?