Question

which feature of the microscope did anton van leeuwenhoek add that enabled him to magnify organisms about 250 times?
drop of water
light from oil lamp
tubes that extend
polished lenses

Explanation:

Anton van Leeuwenhoek made highly - polished single - lens microscopes. His polished lenses allowed for a magnification of about 250 times. A drop of water, light from an oil lamp, or tubes that extend were not the features that enabled this level of magnification.

Answer:

polished lenses