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In this optics activity, learners discover basic lens-making techniques by using a tennis ball to make a lens out of ice.

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

In this optics activity, learners make a simple telescope using two lenses and a cardboard tube. Learners construct the telescope and then calculate its magnification.

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

In this activity, learners use a laser pointer, empty soda bottle, rubber plug and water to demonstrate total internal reflection.