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“光在同种均匀介质中是沿直线传播的”,为了便于学生理解,强调介质的均匀性,各种教材上都给出光在同种非均匀介质中不一定沿直线传播的一些例证。如,早晨太阳光在不均匀的大气中沿曲线传播,海面与沙漠上空的空气不均匀造成的海市蜃楼,夜空中的星星为什么会“眨眼睛”等。由于这些自然现象涉及光程很长,在实验室中无法模拟。虽然可以通过电教手段播放相关的动画、录像,但给人的感觉总是不够真切。如何让学生在实验室中(甚至在讲桌上)亲眼看到“光在同种非均匀介
“Light travels in a straight line in the same homogeneous medium.” To facilitate students’ understanding and emphasize the homogeneity of the medium, various textbooks have given examples of light not necessarily traveling in a straight line in the same inhomogeneous medium. For example, in the morning, sunlight spreads along a curved line in an uneven atmosphere, the mirage caused by the uneven air above the sea surface and the desert, and why the stars in the night sky “blink” their eyes. Because these natural phenomena involve long optical paths, they cannot be simulated in the laboratory. Although the related animations and videos can be played through audio-visual education, the feeling of giving people is always not enough. How to let students see in the laboratory (even at the desk) that "the light is in the same kind of inhomogeneous