The right aswer is a microscope.
The microscope is an optical instrument that makes it possible to examine objects or elements invisible or difficult to see with the naked eye, thanks to a lens.
Subsequently, the tool evolved, in terms of its shape and its lenses: in 1667, Robert Hooke realizes the first complete model as we know it: composed of a table, a system of development and a condenser light, the device will be used to discover the cell.
