sep 1, 1938 - Phase-Contrast Microscope
Description:
Frits Zernike's invention of the phase-contrast microscope, an instrument that permits the study of internal cell structure without the need to stain and thus kill the cells.
While studying the flaws that occur in some diffraction gratings because of the imperfect spacing of engraved lines, he discovered the phase-contrast principle. He noted that he could distinguish the light rays that passed through different transparent materials. He built a microscope using that principle in 1938.
Fritz Zernike (6 July 1888- 10 March 1966) was a Dutch Physicist
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Microscope History
Shivanhsu Garg
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