PreQuiz (See related pages) 1 Where is the dirt? A micro student looking through his microscope observed a small, spherical object. The student felt something must be wrong since he was looking at a slide of Spirogyra. His lab partner suggested maybe it was dirt? He rotated his ocular lens to see if the speck would rotate. It did not rotate. What should he check next? A) Clean the objective lens B) Clean the ocular lens C) Adjust the diaphragm D) Adjust the condenser 2 On a light microscope, what do you adjust to maximize the amount of light entering the objective lens and minimize the amount of light lost to refraction? A) Fine focus B) Ocular lenses C) Objective lens D) Condenser position 3 A _________ microscope converts slight differences in light refraction to much larger differences in contrast. A) phase-contrast B) brightfield C) darkfield D) fluorescent 4 What do you need to adjust on a light microscope if the slide is not centered over the light beam emanating from the condenser? A) Objective lens B) Stage C) Course focus D) Diaphragm 5 When first viewing a slide should you keep the voltage or your light source at a minimum or maximum? A) Minimum B) Maximum
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