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In this activity, learners will make a thaumatrope, an old-fashioned optical illusion that dates back to the 1820s.

Challenge popular misconceptions, learners explore how a mirror actually reflects an image in this activity.

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.