Achromatic versus Apochromatic Lenses in Telescopes
Creating Your Own TelescopeMaterials that you will need: Magnifying glass, Masking tape, Flashlight, Thin piece of paper, a pair of reading glass with low numbers, yardstick, and an assistant.
Tape the reading glasses to the yardstick making sure one lens is out on the side.
Place the flashlight on a stand about twelve feet away.
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