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今年,舅舅家的哥哥上大学了,国庆放假回家的时候,一大家人欢聚一堂,为哥哥接风。席间我发现了一个奇怪的现象:我们使用的酒杯空着时,和普通的酒杯一样,但当你向杯中倒入酒时,杯底便会呈现出一幅栩栩如生的龙凤图案,而当你饮完杯中的酒后,“龙凤”也跟着无影无踪了。我把这个神奇的酒杯称为“魔杯”。提出问题:“魔杯”为什么有酒时能呈现图像,而无酒时就不能呢?做出猜想:因为“魔杯”的底部有圆弧形的凸起,相当于一个焦距很短的凸透镜,所以我觉得可能是
This year, my uncle’s brother went to college. When the National Day holiday went home, a great family gathered together to welcome his brother. During the show, I found a weird phenomenon: the glass we used was empty, just like a normal glass, but when you poured wine into the glass, the bottom of the glass presented a vivid dragon and phoenix pattern. You drink the cup of wine, “Dragon and Phoenix ” followed without a trace. I call this magical goblet “Magic Cup”. Ask a question: “Magic Cup ” Why do you have a picture of a wine while you drink without it? Make a guess: Because the bottom of the Magic Cup has a rounded projection equal to a focal length Very short convex lens, so I think it may be