An image viewed under the microscope is clearly seen under both the 10´ and 40´ objectives, but it is not visible under ´100. What is the most likely reason for this?
a. Oil is too thick on the slide.
b. The slide is placed upside down on the stage.
c. The slide has a coverslip on it.
d. No oil is on the slide.
ANS: B
When an image is clearly visible under both 10´ and 40´ objective lenses but nothing is seen under oil immersion, even with oil on the slide, the slide is most likely upside down on the stage. The clinician should clean the oil off the wrong slide and turn the slide over, placing oil on the top side.
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