Which design innovation in microscopy during the 1930s significantly advanced scientific research by allowing scientists to see objects smaller than the wavelength of visible light?

Test your knowledge about one of the most transformative scientific instruments in history. The microscope's design evolution revolutionized multiple scientific fields from biology to materials science. This poll explores a pivotal design innovation that dramatically expanded the microscope's capabilities and opened new frontiers in scientific research.

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Electron microscopy, which uses beams of accelerated electrons instead of light
Phase-contrast microscopy, which enhances contrast in transparent specimens
Fluorescence microscopy, which uses fluorescent dyes to highlight specific structures
Confocal microscopy, which eliminates out-of-focus light in thick samples