Visualization of the Path of Light to Understand the Regularity of the Image of a Convex Lens and to Improve Drawing Skills

—Using a Device that Changes the Path of Light as its Source Moves and a Simulation—

Abstract

In this study, we developed teaching materials to enhance students’ understanding of the regularity of images produced by convex lenses in junior high school science classes, and to improve upon their ability to find the position and size of the actual image by drawing the path of light. The first part utilized a device to observe the path of light changing according to the position of the light source. The students were thus able to observe the path of light, which could not be observed in the optical table experiment. The second part employed a simulation of changes in the path of light. Emphasis was placed on the fact that the system could be operated via the student’s devices and could be changed by the teacher. By using these two materials in the lesson, the students’ understanding of the rules improved and, further, their drawing skills were enhanced. Indeed, the device that allows students to see the path of light was particularly effective in improving their drawing skills.