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In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.

1 cent - $1 per student Ages 4 - 11 5 to 10 minutes
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In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

$1 - $5 per group Ages 4 - 18 5 to 10 minutes