In phase contrast microscopy, the function of the phase ring is to:

a. Direct light through its open circular area
b. Retard the wavelength of deflected light
c. Project the beam of light onto the sample
d. Diffract the light from the condenser


Correct Answer: B

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A. 120 to 180 days B. 90 to 120 days C. 30 to 90 days D. Any period of time is acceptable

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