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Type of lens made by drawing out a glass rod in a flame. The rod is then cut (when cool) The rod is then held vertically and fed into the flame to make a little ball on the end, which should be about 2-4 mm in diameter. This ball can now be used as a lens giving a magnification of 100. To use the microscope the lens must be held almost in contact with the eye. A sample is held almost in contact with the lens.