What should be adjusted if two overlapping images, instead of only one, are seen when looking through a microscope?
a. Field diaphragm
b. Fine adjustment knob
c. Condenser knob
d. Interpupillary control
ANS: D
The lateral separation of the two eyepieces is adjusted by using the interpupillary control. When properly adjusted, only one image is clearly seen. The focus control sharpens an image. The condenser knob adjusts the position of the condenser, and the field diaphragm controls the amount of light coming through to the slide.
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