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In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).

In this activity, learners examine how colored lenses act like filters and absorb all colors of light except for the color of the lenses.

In this lab (Activity #1 on page), learners explore how we see color.

In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.