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在平面镜成像的教学中,我们常利用蜡烛和玻璃板做演示实验(课本图1-8):在桌面上竖直放置一块玻璃板,玻璃板的前面点一支蜡烛,此时会看到玻璃板的后面有蜡烛的像。再拿一文同样的,但没有点着的蜡烛,把它放到玻璃板后面蜡烛的像的位置,这支蜡烛也好像点着似的。用这个演示实验可以直观和明确地显示出平面镜成像的特点。但是,由于玻璃的透光性太强,白天在教室里演示,看到的虚像往往不会很清晰,另外也不能从教室里各个角度都清楚地看到像。为此,建议作以下改进:1.用茶色玻璃代替普通玻璃,使虚像清晰;2.玻璃板用一框架固定,确保玻璃板
In the teaching of plane mirror imaging, we often use candles and glass plates as demonstration experiments (textbook picture 1-8): Place a glass plate vertically on the table, and place a candle in front of the glass plate. At this time, we will see the glass. There is a candle like the back of the board. Take the same thing again, but without the lighted candle, place it in the position of the candle behind the glass. This candle is also like a point. With this demonstration experiment, the characteristics of plane mirror imaging can be intuitively and clearly shown. However, due to the high light transmittance of the glass, it is often not demonstrated in the classroom during daytime demonstrations. In addition, it is impossible to clearly see the images from all angles in the classroom. For this reason, the following improvements are proposed: 1. Replace the ordinary glass with brown glass to make the virtual image clear; 2. The glass plate is fixed with a frame to ensure the glass plate