The Iris of the Optical Microscope Is ____

Multiple Choice

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