What Part of the Microscope Regulates the Amount of Light

Question

What part of the microscope regulates the amount of light that passes through the slide?
A)Fine adjustment knob
B)Condenser
C)Substage light
D)Iris diaphragm

Accepted Answer

The iris diaphragm is a part of the microscope that adjusts the amount of light that reaches the slide by opening or closing its aperture.