positive phase contrast microscopy
Phase contrast microscopy where the phase plate advances the un-diffracted light relative to the diffracted light by a quarter wavelength (λ/4). Since diffracted light is already retarded by ~λ/4 through interaction with the object, the result is a half-wave phase difference and destructive interference.
Synonyms: positive phase contrast
See also: phase , phase object , phase plate , phase difference , phase contrast microscopy , interference , negative phase contrast microscopy
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