Fritts Zernike invented the phase contrast microscope in 1932.
He received a Nobel Prize for it in 1953.
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Frits Zernike
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phase contrast
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halo formation
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The microscope that takes advantage of differences in the
refractive indexes of cell structure is the phase contrast
microscope. The microscope that is used to see internal structure
of cells in a natural state is also a phase contrast
microscope.