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A simple homemade microscope has been devised using a single water droplet lens, which proved to be practical for classroom use in school. In order to prevent evaporation of water, the water droplet lens was encapsulated in a plastic vessel together with wetted paper. By changing the amount of water in a metal ring (4.5 mm diameter with thickness 0.6 mm) attached to the bottom of the plastic vessel, the magnification could be varied from around ×6 to ×30. It was also demonstrated thatdoi:10.1088/0031-9120/36/2/301 fatcat:wsac652cmbfarhs6vyi3olnyqm