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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 use an old CD to construct a spectroscope, a device that separates light into its component colors.

Like water drops in falling rain, a CD separates white light into all the colors that make it up.

Learners demonstrate how water can distort, refract and magnify light.

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

In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water.

In this three-part activity, learners conduct simple experiments to see how light refracts and reflects, and how colors of light affect what we see.

In this four-part activity, learners explore light and sound through a variety of hands-on investigations.

In this optics activity, learners use glass and water to demonstrate total internal reflection (TIR).

In this activity (posted on March 14, 2011), learners follow the steps to construct a camera projector to explore lenses and refraction.

In this activity, learners make their own heat waves in an aquarium.

In this activity, learners make optical fibers out of strips of gelatin.

In this optics activity, learners explore how they can make gelatin stop light, but not stop them from seeing fruit suspended within.

Learners experiment with water gel crystals, or sodium polyacrylate crystals, which absorb hundreds of times their weight in water. When in pure water, the water gel crystals cannot be seen.

In this activity related to microbes, learners use water drops and hand lenses to begin the exploration of magnification. This activity also introduces learners to the microscope.

In this optics activity, learners discover how they can make glass objects "disappear." Learners submerge glass objects like stirring rods into a beaker of Wesson™ oil to explore how the principles of

In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair.

This hands-on astronomy activity allows you to create a “cutaway” telescope to clearly show how reflector and refractor telescopes work.

In this optics activity, learners make a "light fountain" from a clear plastic bottle, flashlight, and other simple materials.

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.