Sid the a Science Kid experiments with a magnifying glass. The video is meant to prepare and excite students.
Source: YouTube.com
Allow students to explore.
Explain that moving the magnifying glass closer, makes the object smaller and vice versa.
Observe and assist as needed.
Ask questions: "What do you see?" "How is that different from looking without the magnifying glass?"
Give students drawing/writing paper as shown below. Ask them to pick one object and draw what they are seeing. Encourage them to keep looking back for details. Then, ask them to write a few sentences describing what they see. Give the opportunity for sharing with classmates.
Source: Pinterest.com
You can watch this fun video for wrapping up in class or they can watch it at home.