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In this optics activity, learners discover basic lens-making techniques by using a tennis ball to make a lens out of ice.

In this optics activity, learners make a simple telescope using two lenses and a cardboard tube. Learners construct the telescope and then calculate its magnification.

This activity provides instructions for building a mirrored tube--a smaller and simpler version of a submarine's periscope--that lets you see around corners and over walls.

This fun and simple hands-on astronomy activity lets learners explore the difference between telescope magnification and resolution.