To illuminate how afterimage occurs, create a star, square, or other geometric-shaped light for learners to look at for 30 seconds. Then, have them explain what they see as they shift their focus to a blank wall. A full explanation of how the negative image appears is provided so that you can teach your class about this phenomenon during a unit on light or the eye. 

Concepts

retina, eyes, vision, light

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Additional Tags

light, afterimage, perception, retina, eye, science

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Pros

• A fun and vivid demonstration of how sensitive the retina is 
• A thorough explanation and extension ideas are provided to strengthen your background

Cons

• None