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This resource contains several mini-explorations using a slide projector as a light source to investigate light and the properties of images.

Discover how a refracting telescope works by making one from scratch using common items. This telescope won't have a tube so the learner can see how an image is formed inside the telescope.

Focus sound through a balloon! In this Exploratorium activity, you'll use dry ice to create a balloon that's a sound lens.

Did you know that using a lens one can bend light to make pictures of the world? It's true!