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.
Iris and Pupil. The colored part of the eye is the iris. It is a muscle that controls the pupil, the opening in the middle of the eye that controls the amount of light coming in. Lens and Retina. The lens is behind the pupil and focuses light onto the retina, the light-sensitive cells on the back of the eyeball.