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Pinhole Magnifier
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In this activity related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object.
Thaumatropes
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In this activity, learners will make a thaumatrope, an old-fashioned optical illusion that dates back to the 1820s.
Spinning Cylinder: Make a triangle appear on a spinning wheel
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Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.
Whirling Watcher: Make a Stroboscope
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In this activity, learners make a stroboscope--a spinning disk with slits around the edge that you look through.
Seeing Is Believing
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This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'
Mix-N-Match Light
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This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.
Measure Your Ability to See
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In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.
Benham's Disk
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In this optics activity, learners discover that when they rotate a special black and white pattern called a Benham's Disk, it produces the illusion of colored rings.