Question

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.

Answer 1

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.)close, increase
c.)close, dim
d.)open, dim 
your answer is : c.)close, dim