Electron microscope

Electron waves, having wavelengths similar to X rays but easier to focus, were utilized to create the electron microscope, allowing much smaller objects to be observed compared to traditional microscopes. This innovation marked a significant advancement in microscopy through the use of magnetic fields to focus electron waves.
 Ernst August Friedrich Ruska Germany 1932 Electron microscope

Electron waves, having wavelengths similar to X rays but easier to focus, were utilized to create the electron microscope, allowing much smaller objects to be observed compared to traditional microscopes. This innovation marked a significant advancement in microscopy through the use of magnetic fields to focus electron waves.