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In this optics activity, learners use water to make a coin "appear" and "disappear." Use this activity to demonstrate how light refracts and introduce light as waves.

In this activity about vision and optical illusions, learners conduct a simple test to demonstrate how our eyes create "afterimages." Learners stare at a black cardboard bat for at least 30 seconds an

In this activity, learners create an optical illusion by spinning two attached cups. A round ball seems to magically appear when the cups spin.

This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

In this optics activity, learners use paint thinner to make a small jar seem to disappear inside a larger jar.

In this activity, learners surprise their eyes with an optical illusion involving arrows made out of pipe cleaners.