The result if the electron microscope had not been invented would be Microscope magnification would be limited to 1000×.
Explanation:
A high resolution of images of biological and non biological specimens can be obtained by the use of Electron microscopy. The structure of cells, organelles, tissues can be studied in detail with the help of an electron microscope. The usage of electrons helps in getting a high resolution of images in an electron microscope.
Electrons with shorter wavelength are used for getting the illumination. A compound light microscope has a resolution of 500 times lesser than the electron microscope's magnification. When this type of microscope is not invented then the magnification will have been limited to 1000x.