All of the following are correct steps in focusing on a specimen under the microscope EXCEPT which statement?
A) When you are ready to change magnification, do not move the adjustment knobs before changing the objective lens.
B) Once the image is clear, use the fine adjustment knob to focus on small details.
C) Start with a high-power objective lens when focusing.
D) If two images are visible, slowly move the body tubes closer together until you see, with both eyes open, a single circular field of view.
C
Explanation:
A) Most microscopes are parfocal, which means they are designed to stay in focus when you change from one objective lens to another.
B) Always use the coarse adjustment knob to get the image into focus and then use the fine adjustment knob to examine detailed structures.
D) The distance between the ocular lenses is adjustable for the distance between the two pupils of your eyes so that a single image is seen in the microscope.
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