The magic magnifier

@inproceedings{Andereck2001TheMM,
  title={The magic magnifier},
  author={Barbara S. Andereck and Sherri Secrest},
  year={2001}
}
An inexpensive magnifier with an extended tube that enables clear images to be readily seen can be constructed from PVC pipe and small converging lenses. Students can calculate the design parameters and predict the magnification.