A more advanced 100 square foot colored concrete patio installation costs homeowners between $713 and $933 on average, which includes $188 to $204 worth of materials and $525 to $728 worth of labor costs.
The Diaphragm or diaphragm control lever regulates the amount of light passing through the slide specimen on the microscope stage.
The iris controls the amount of light that is entering the pupil. When its dark out, the sphincter muscles on the iris ease to dilate the pupil, but when its light out, the sp â¦ hincter muscles contract to constrict the opening of the pupil.