Koehler illumination:
a. Is best achieved using a tungsten-halogen lightbulb
b. Allows the brightest amount of light to be in the center of a field
c. Adjusts for even light across a field
d. Changes the intensity of the light across a field
ANS: C
A microscope with a nonfixed (movable) condenser should be adjusted for Koehler illumination to achieve the best imaging quality possible for the scope. Koehler illumination makes adjustments in various components of the microscope so that even light is present across a field.
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