【求高人帮助】我实在是英语不好，马上假就放完了，要交作业内

作业要求，students are to look at five examples of optical devices using lenses andto write a sentence explaining how the lens works in one of the devices.

我example已经写了有望远镜，显微镜，放大镜，眼镜，照相机。主要是那坑爹的原理说明【要英文版的】