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In psychology, the Zeigarnik effect states that people remember uncompleted or interrupted tasks better than completed tasks. In Gestalt psychology, the Zeigarnik effect has been used to demonstrate the general presence of Gestalt phenomena: not just appearing as perceptual effects, but also present in cognition.[1]
Zernike succeeded in devising a method--now known as Phase Contrast microscopy--for making unstained, phase objects yield contrast images as if they were amplitude objects. Amplitude objects show excellent contrast when the diffracted and direct light are out of step (display a phase difference) by 1/2 of a wavelength.hase microscopy techniques are particularly useful with specimens that are thin and scattered in the field of view. There are some limitations of phase contrast microscopy: Phase images are usually surrounded by halos around the outlines of details.