You are looking at very lightly stained cells under the microscope, and you want to increase the contrast so that you can see them "better." You _________ the iris diaphragm to ________the light.
A)open, increase
B)open, dim
C)close, increase
D)close, dim

Question

Quizplus · Accepted Answer

Closing the iris diaphragm reduces the amount of light entering the microscope, which increases contrast by dimming the light, making details in lightly stained cells more visible.

You Are Looking at Very Lightly Stained Cells Under the Microscope