What Do You See?

Overview

Human vision is dependent on light. We can only see if the light-sensitive cells on our retina at the back of our eyes get triggered by light entering the eye. As a result, we can only see objects that either are illuminated and reflect light back into our eyes, or objects that emit light. Any object that is in complete darkness is not visible to the human eye. In this lesson plan, students will place different objects inside a box and view them under different light conditions. By doing so, students will realize that our ability to see an object clearly is light-dependent. The more light that is present, the more details of an object can be seen.

Remote learning: This lesson plan can be conducted remotely. The Engage section of the lesson can be done over a video call, then students can work individually and independently during the Explore section, using the student worksheet as guide. A set of materials can be prepared in advance or students can use materials found around the house. And adult will be needed to assist with the preparation of the box. End the lesson with discussion over a video call during the Reflect section.

NGSS Alignment

• 1-PS4-2. Make observations to construct an evidence-based account that objects in darkness can be seen only when illuminated.

Materials

For each student group of 3:

• Cardboard box (shoe box or mailing box)
• Black tape
• Sharpened pencil
• Various objects that fit into the box, some of them luminous, such as a glow stick, light-up toys, etc.
• Optional: Flashlight

For the teacher:

• Utility knife or scissors
• Double-sided tape