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A student looks through a microscope and sees a dark spot. Upon moving the slide he notices that the dark spot does not move. Indicate the two possibilities as to cause of the problem.

User Anyelo
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1 Answer

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The substage condenser is either incorrectly positioned or the light stop is the wrong size for the objective- or there me be a smudge/mark on the eyepiece
User RobWhistler
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