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当学生拿到三棱镜或梯形玻璃砖时,最能激起他们强烈兴趣的莫过于透过棱镜看到所有物体的边缘都镶上了美丽的虹彩.引导学生仔细观察这些色彩的排列顺序,跟白光的色散对比,并进而运用折射和色散的知识去进行解释,自然是很有意义的. 虹彩主要发生在黑白对比强烈的两个物体交界处,例如在物体的迎光面和阴暗面交界处,在明亮背景下的暗物体边缘上或在发光的灯具边缘上.现在让我
When students take the prism or trapezoidal glass bricks, the most exciting thing that attracts their interest is to see the edges of all the objects are beautifully iridescent through the prism. Guide the students to carefully observe the order of the colors, with white light. Dispersion contrast, and then use the knowledge of refraction and dispersion to explain, is naturally very meaningful. Iridescence mainly occurs at the junction of two objects with strong contrast in black and white, for example, at the junction of the obverse and dark side of the object, in bright On the edge of a dark object in the background or on the edge of a glowing light fixture. Let me now