Phase Contrast Technique

Some articles on phase:

List Of Dutch Inventions And Discoveries - Inventions - 1933 Phase Contrast Microscope
... a medium other than vacuum, interaction with this medium causes its amplitude and phase to change in a way which depends on properties of the medium ... The human eye measures only the energy of light arriving on the retina, so changes in phase are not easily observed, yet often these changes in phase carry a large amount of information ... although the phase variations introduced by the sample are preserved by the instrument (at least in the limit of the perfect imaging instrument) this information is lost in the process ...

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