The lab activity requires the use of concave and convex lenses. I use simple small ones that are cheap and easy to buy. In addition, you need to have a small object (penny, pair of dice, etc) and a large object (cabinet, door, tv, etc) for students to examine. They will stay at their desks and use the concave and convex lenses to look at each item (once holding the lens close and once holding it at arm's length). Students will write their observations on the chart provided. Then, students will answer the questions related to the lab. It's up to you if you want to let students use their textbooks, online sources, etc to answer the comprehension/expansion questions. It's an excellent lab for concave lenses, convex lenses, and refraction!