Homemade simple magnifying glass

After class, as soon as I walked into the classroom, I saw a few odd-shaped cups on the teacher's desk. I was very confused. What is this? I talked with my classmates in a slap in the face. Everyone doesn't know what medicine is sold in the teacher's gourd!

The teacher finally came. She sent the cup carefully to each classmate, and then let us take out the text. Through the cup, we can see that the words in the text become very small, just like little ants. Then, the teacher put some water into the cups of each classmate. The water shines brightly under the light of the lights, which is very dazzling. How do we make the cup into a magnifying glass? I thought about it with my head. I tried to put the cup diagonally. Suddenly, I found the word huge and transparent. I looked at my classmates again, and the classmates became a little giant. It’s really fun. What is going on?

It turns out that the water droplets are on the glass, making it thick in the middle and thin around, so that the arc is like a small convex lens. When looking at things, because the object distance is very close, less than the focal length of this convex lens, there will be an enlarged image formation.

Looking at this big and small word, I think this world is really wonderful. Even the most common ones we have hidden a lot of mysteries. We must carefully explore and discover them.

The third grade of Shenjiamen National Primary School in Putuo District, Zhoushan, Zhejiang: Shi Xinyu