The iris of the optical microscope is ____. 

A. the platform that holds the specimen slide
B. the controls that bring the objective being examined into focus
C. the eyepiece through which you view an image
D. a diaphragm that opens and closes to change the amount of light illuminating the specimen
E. the mechanism that controls left-right and forward-backward movement of the stage


D. a diaphragm that opens and closes to change the amount of light illuminating the specimen
The iris of an optical microscope is a diaphragm that opens and closes to increase or decrease the amount of light illuminating the specimen.

Health Professions

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A) True B) False

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Fill in the blank(s) with the appropriate word(s).

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Indicate whether the statement is true or false

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