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In this simple activity, learners investigate refraction by placing a picture of an arrow behind a glass of water.

In this activity, learners discover that nanoparticles of gold can appear red, orange or even blue. They learn that a material can act differently when it’s nanometer-sized.

In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.

In this optics activity, learners explore how light bends and affects what we see.

In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

In this activity, learners use a flashlight, a glass of water, and some milk to examine why the sky is blue and sunsets are red.

In this activity, learners will make their own prism and use a glass of water to separate sunlight into different colors.