Water glass magnifier

As soon as I walked into the classroom, I saw that the classmates were talking about it. Some of them talked about it in a slap in the face. Some of them thought about it with their heads. It really made us feel that the second monk couldn’t figure it out. Everyone didn’t know the teacher’s gourd. What medicine is it sold? Why are there so many odd-shaped cups on the table?

After class, the teacher sent us the glasses. I took the cup and put it on the paper to see the words, the words became clear and small. After a while, the teacher added some water to our cup. The crystal clear water shines brightly under the light of the light, very dazzling.

So how do you make a homemade magnifying glass? Some of the classmates worked happily; some of them sat up with their hands and feet; some students were doing it with all their hands. I smashed the cup and the small drops of water rolled up. At this time, the words became clear and huge, which was really amazing. I used a cup to pick up the pencil case. The pencil was big and fat, like a thick water pipe. The rubber is also like this, like a delicious pie.

But why is this? I am really puzzling. It turns out that the water droplets are on the glass, the middle is thick, and the circumference is thin. Such a curvature is like a small convex lens. When looking at things, because the object distance is very close, it is smaller than the focal length of the convex lens, thus forming an enlarged vertical image.

This class is really interesting. Don't look at things that are common. But small things have a lot of truth.

Third grade: Huang Yuyao