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In this activity, learners investigate color vision as well as plan and conduct their own experiments.

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 investigate the sense of sight and develop and conduct their own experiments.

In this activity, learners explore the many uses of periscopes and how this simple device was designed and is used in many applications.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary.